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Reference List: Basic Rules

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Note:  This page reflects the latest version of the APA Publication Manual (i.e., APA 7), which released in October 2019. The equivalent resource for the older APA 6 style  can be found here .

This resource, revised according to the 7 th  edition APA Publication Manual, provides fundamental guidelines for constructing the reference pages of research papers. For more information, please consult the   Publication Manual of the American Psychological Association , (7 th  ed.).

This page gives basic guidelines for formatting the reference list at the end of a standard APA research paper. Most sources follow fairly straightforward rules. However, because sources obtained from academic journals  carry special weight in research writing, these sources are subject to special rules . Thus, this page presents basic guidelines for citing academic journals separate from its "ordinary" basic guidelines. This distinction is made clear below.

Note:  Because the information on this page pertains to virtually all citations, we've highlighted one important difference between APA 6 and APA 7 with an underlined note written in red.

Formatting a Reference List

Your reference list should appear at the end of your paper. It provides the information necessary for a reader to locate and retrieve any source you cite in the body of the paper. Each source you cite in the paper must appear in your reference list; likewise, each entry in the reference list must be cited in your text.

Your references should begin on a new page separate from the text of the essay; label this page "References" in bold, centered at the top of the page (do NOT underline or use quotation marks for the title). All text should be double-spaced just like the rest of your essay.

Basic Rules for Most Sources

Basic Rules for Articles in Academic Journals

Please note:  While the APA manual provides examples of how to cite common types of sources, it does not cover all conceivable sources. If you must cite a source that APA does not address, the APA suggests finding an example that is similar to your source and using that format. For more information, see page 282 of the   Publication Manual of the American Psychological Association , 7 th  ed.

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APA vs MLA | The Key Differences in Format & Citation

Published on January 9, 2020 by Shona McCombes . Revised on August 23, 2022.

APA vs MLA: The key differences in citation and formatting.

APA Style Is defined in the Publication Manual of the American Psychological Association , currently in its 7th edition .

The rules of MLA style are found in the  MLA Handbook , currently in its 9th edition (published by the Modern Language Association).

In both styles, a source citation consists of:

However, citations look slightly different in each style, with different rules for things like title capitalization, author names, and placement of the date.

There are also some differences in layout and formatting . Download the Word templates for a correctly formatted paper in either style.

APA template MLA template

Table of contents

Which style should i use, in-text citations in apa and mla, apa reference list vs. mla works cited list, apa vs. mla paper formatting, frequently asked questions about citation styles.

You’ll usually be told which citation style you should use in your writing by your department or supervisor. If you’re not sure, look up your institution’s guidelines or ask directly.

Occasionally, you may be allowed to choose a style yourself. If so, it’s best to base your decision on your area of study:

Both MLA and APA use parenthetical citations to cite sources in the text. However, they include slightly different information.

An APA in-text citation includes the author’s last name and the publication year. If you’re quoting or paraphrasing a specific passage, you also add a page number.

An MLA in-text citation includes the author’s last name and a page number—no year.

When there are two authors, APA Style separates their names with an ampersand (&), while MLA uses “and.” For three or more authors, both styles list the first author followed by “ et al. ”

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purdue mla apa

In both APA and MLA style, you list full details of all cited sources on a separate page at the end of your paper. In APA this is usually called the reference list ; in MLA it’s called the Works Cited .

The formatting of source entries is different in each style. Some key differences are summarized in the table below.

Using the interactive tool, you can switch between APA and MLA style citations for common source types to explore the differences for yourself.

Generate accurate citations with Scribbr

The Scribbr Citation Generator will automatically create a flawless APA citation

The Scribbr Citation Generator will automatically create a flawless MLA citation

The general formatting guidelines for APA and MLA are similar. Both styles recommend:

The main differences between APA format and MLA format involve the title page, running head, and block quoting guidelines.

Title page and header

In APA, a separate cover page is required. It lists the title of your paper, your full name, your institution and department, the course the paper is for, your instructor’s name, and the due date, all centered and double-spaced.

APA title page - student version (7th edition)

In MLA, no title page is required (though your instructor may require you to include one ). Instead of a title page, you add a four-line header on the first page.

The header is left-aligned and double-spaced and lists your full name, your instructor’s name, the course title or number, and the submission date. The paper’s title is centered on a new line under the header.

MLA header

Running head

In APA Style, include a right-aligned page number at the top of each page.

In manuscripts that will be submitted for publication, you should also include an APA running head with a shortened version of your paper’s title (up to 50 characters long), all in capitals and left-aligned.

The running head is not required in student papers (unless you’re instructed otherwise).

APA running head (7th edition)

Block quote formatting

Block quotes are long quotations that are set on a new line and indented as a block,  without quotation marks.

In APA, any quote of 40 words or longer should be formatted as a block quote. In MLA, block quote formatting is used for quotes of more than four lines of prose or more than three lines of verse.

In both styles, the in-text citation is added after the period at the end of a block quote.

The reader quickly becomes familiar with Nick Carraway’s relationship with Jay Gatsby, as the very first mention of the character illustrates both his admiration and disdain:

APA and MLA style both use parenthetical in-text citations to cite sources and include a full list of references at the end, but they differ in other ways:

Check if your university or course guidelines specify which citation style to use. If the choice is left up to you, consider which style is most commonly used in your field.

Other more specialized styles exist for certain fields, such as Bluebook and OSCOLA for law.

The most important thing is to choose one style and use it consistently throughout your text.

APA format is widely used by professionals, researchers, and students in the social and behavioral sciences, including fields like education, psychology, and business.

Be sure to check the guidelines of your university or the journal you want to be published in to double-check which style you should be using.

MLA Style  is the second most used citation style (after APA ). It is mainly used by students and researchers in humanities fields such as literature, languages, and philosophy.

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If you want to cite this source, you can copy and paste the citation or click the “Cite this Scribbr article” button to automatically add the citation to our free Citation Generator.

McCombes, S. (2022, August 23). APA vs MLA | The Key Differences in Format & Citation. Scribbr. Retrieved March 2, 2023, from https://www.scribbr.com/citing-sources/apa-vs-mla/

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Did you know  that almost ALL of UMA Libraries' catalogs and databases will  create citations for you?  When you find a resource, simply scan the database for a  "(quotation mark)"  icon, or for a label such as  Cite this Item,  or  Cite,  or  Citation Export.

Giving Credit to Whom It Is Due When you write a research paper, you must document the sources you used to produce it. When quoting or even paraphrasing another person's idea in your paper, you must give credit to that person so that the reader can find the source you cited. Sources for which you should provide full citations include books, articles, interviews, Internet sources, government documents, software, videotapes, etc. You cite the sources briefly within the text of your paper, and then give the full citation in the "Bibliography" or "Works Cited" section at the end of your paper.

Additionally, IT IS REQUIRED. See UMA's  Academic Integrity Policy  which spells out your responsibility as a student. The way to avoid plagiarism is to carefully cite all sources used. Your instructors will indicate which citation style they want you to use when citing your sources. Most often this is either APA or MLA citation style.

Please double-check citations before submitting your work! We cannot guarantee the accuracy of citations created using these free, online tools.

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Purdue Online Writing Lab (OWL)  site  is a fairly comprehensive resource for the Modern Language Association's (MLA) style and formatting rules. Use the left side bar on OWL's page to navigate to the style or other help that you need.

UPDATED TO 9th ed.

Purdue Online Writing Lab (OWL)  site  is a fairly comprehensive resource for the American Psychological Association (APA) style and formatting rules. Use the left side bar of the OWL page to navigate to the style or other help that you need.

purdue mla apa

CMOS  Style

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MLA In-Text Citations                                   MLA Works Cited

MLA Style Demo (videos)                             MLA Activity (tutorial)

APA In-Text Citations                                    APA References

APA Formatting Guide                                  APA Headings (setting up the paper)

APA Activity (tutorial)                                          APA Side By Side   (compares reference, in-text citation,                                                                                                                      and in-text citation with author set-up)

Chicago Formatting Guidelines                Chicago Notes & Bibliography

Format a Citation in APA Style Using EBSCOhost

Citation help from Academic Search Complete & other EBSCO databases

Academic Search Complete (along with Business Source Complete, PsycInfo, and other EBSCO databases) will create a citation for you! Look for the "Cite" button to view citations in all the major citation formats.

Citation Basics & Links

Citing your sources is an important step in the research and writing process.  Choose one of the following to get started:

Documentation style depends on your area of study. For instance, the American Psychological Association (APA) citation style is often used in the social sciences, whereas the Modern Language Association (MLA) style is used in the humanities. Check with your professor to be sure you are using the right style for your papers.

Here's a short overview of citations:

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Apps and Extensions to Help You With APA Citations

Many colleges and universities, including Purdue University Global, rely on the American Psychological Association (APA) Publication Manual to guide writing usage and grammar style. While the best resource for APA Style is both the website and the publication manual itself, if you’re in the middle of research and need help quickly, you might need to look at research management software in the form of citation generators.

Many developers have created helpful generators to create citations and help you write in APA Style. From APA citation apps to browser extensions to websites, here are some citation manager tools.

Websites for Citations

Several websites can help generate citations in APA Style and other styles. When looking for a citation generator, test that it appropriately cites different sources and reviews all of your citations for accuracy before submitting any class assignments.

Academic Writer

Academic Writer is a tool that is offered by many institutions, including Purdue Global, to help students write in APA Style. It is developed by the APA and includes videos and tutorials about APA Style. You can also manage your references and format your paper by creating an account within the site.

APA Citation Wizards

This online tool offers a quick and easy way to create references for online books, online journal articles, and web pages.

This online tool offers grammar, punctuation, and plagiarism checkers for a fee, but a citation creator is free to use. APA, MLA, Chicago, and other styles are available to use.

Citation Machine  ®

This tool allows students to create references in APA and a variety of other formats. You can either enter the information manually or search source by name or URL, which the Citation Machine then will fill in automatically.

Cite This For Me

Cite This For Me is a free citation generator that can create citations in APA, MLA, Harvard, Chicago, ASA, IEEE, and AMA style. The site is fairly bare-bones, providing only the generator and some general guidance on when citations are appropriate.

EasyBib ®

EasyBib offers citation creation and will also scan your paper for plagiarism and grammar errors. It’s powered by the same service that runs Citation Machine mentioned previously.

Formatically

This web-based citation generator offers a simple interface and quick results. It gives you results in MLA, APA, Chicago, or Harvard format.

This old-style online citation generator creates a basic citation for books in APA format. Choose APA from the menu on the left and fill out the fields to create a citation.

Mendeley is an all-inclusive research tool. It is primarily used as a document organizer and research aid, but it also generates references, citations, and bibliographies in a number of different styles.

This web-based generator is easy to use and walks you through everything you need to do to get APA citations. It also offers AMA, Chicago, Harvard, IEEE, MLA, and more. Be sure to use the most recent version of APA (7th edition) when you use it.

Scribbr is an easy-to-use online citation generator that uses the 7th edition of APA Style. The generator is free for students. Scribbr also offers a plagiarism checker, spell checker, and grammar proofing.

Zotero is a robust research tool available for download and includes a quick version for use online. While the program is helpful for many types of research, it also offers a feature that creates references and bibliographies for any text editor and directly inside Word, LibreOffice, and Google Docs.

Apps for Citations

Almost 55% of website users browse the web and work on their mobile devices, according to StatCounter . A number of mobile-first citation apps are available to help with APA citation.

Author ( Apple )

This paid app available for Apple devices provides a tailor-made writing environment. It provides a word processor that automatically saves and works well with Apple apps like Reader. As part of the tool, you can create autocitations by copying from PDF in the companion application Reader and pasting as a full citation in Author or pasting the BibTex or DOI from an academic PDF.

Citation Generator ( Free Google Play Version , Paid Google Play Version )

This mobile app, offered in both a lite and full version, offers no-nonsense citation guidance. The free version only supports book, newspaper, software, Twitter, and website sources, whereas the paid version includes 25 in-text citations and reference generators.

Citation Maker ( Google Play Store )

This app has an easily understandable layout that produces both MLA and APA formats and can work with a variety of resource formats. It also gives you a preview as you type and can even create citations with incomplete information. Some reviews suggest you double-check results produced by Citation Maker for capitalization errors.

Citationsy ( Apple and Google Play Store )

This app, available for both Apple and Android devices, allows you to use your device to scan barcodes of references and then generate citations. Citationsy includes search engines for books, music, podcasts, and scientific papers.

Easy Referencing – Citation ( Apple )

This app for iPads will scan a book barcode and serve up citations for a variety of styles, including APA. It also supports university-specific styles and will use the correct one required.

Google Chrome Browser Extensions

Almost 65% of online users prefer Google Chrome for their browser, according to StatCounter . One appeal of the browser from tech giant Google is that it comes with a robust selection of extensions. Several Chrome extensions can help you create APA citations.

Bibcitation and Automatic Citation Generator

This extension works on websites and journal articles, generating citations in MLA, APA, Chicago, and more. It can add citations to a list if you have an account with Bibcitation.com.

This extension creates Endnote, APA, MLA, and customized bibliography items from journal articles, books, and more. The program allows you to copy the citation to put it into an editable format.

Citationsy – Cite Websites and Papers

An extension version of the Citationsy mobile apps above, this tool cites articles, books, papers, podcasts, songs, websites, and more. It supports APA, Harvard, MLA, and many other reference styles.

Cite This For Me: Web Citer

This extension automatically creates citations in APA, MLA, Chicago, or Harvard styles. Browse to your web page and click the button for a citation.

EasyBib Toolbar

This toolbar not only generates citations but also gives you advice on the credibility of the website you’re citing, which can help with the overall strength of a paper or other work. It will format, alphabetize, and make your bibliography ready to use.

Free APA and MLA Citation Generator  

This extension quickly generates sources in MLA, APA, or Chicago. It allows you to add to a bibliography with a quick click of the toolbar icon.

MyBib: Free Citation Generator

This simple browser extension creates APA format, MLA 8 format, and Harvard referencing style citations that can be downloaded and put into Microsoft Word. The extension works with any URL, including PDFs hosted online.

Plagly – Citation Generator

This extension is a bibliography and citation generator for a variety of different types of content, including films and podcasts. It can give you citations in MLA, APA, Chicago, and other formats.

This tool exports web pages and creates a built-in bibliography in MLA and APA format. It also checks a page’s credibility.

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Since 1976, the Writing Lab has supported writers on the West Lafayette campus through a variety of services and community engagement initiatives using student-centered best practices. The Online Writing Lab (OWL) has been an extension of the Writing Lab since 1993, and offers global support through online reference materials and services. The Writing Lab and OWL, both part of the Department of English, are informed by and engage in research within the discipline of Composition and Rhetoric, including the subfields of writing center studies, writing program administration, second language studies, and professional writing.

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Primary Sources in Archives & Special Collections

Traditional Paper Sources: Booth Tarkington letter to George Ade

How to cite a traditional paper primary source document.

Citing a primary source document, from an archives, varies depending on the preference of your instructor, the publication you are submitting the article, or the discipline in which you are operating.  You may wish to consult the Purdue Online Writing Lab (OWL) for further information. The particular style may be the American Psychological Assocaition (APA), the Modern Language Association (MLA), the Chicago Manual of Style, etc.

There are several elements to the citation which may be necessary to properly cite a document such as the Booth Tarkington letter to the left.

The document: The creator or author, specific item title, page, section, date.

Box and file number: The majority of materials found in archives, that are not books, are housed in some sort of container and within the container the various items are separated for various reasons in files.

Repository: This is the name of the archives.

The document shown above is found in the:

Collection: George Ade Papers, 1878-2007

Series: Series 2: Correspondence, ca. 1882-1947; n.d.

Box: Box 10: Correspondence, Sto-U, ca. 1894-1943

File: Folder 5: Tarkington, Booth, ca. 1905-1943

Archives:  Purdue University Archives and Special Collections, Purdue University Libraries, West Lafayette, Indiana.

The Booth Tarkington letter shown here could be cited in the following ways:

American Psychological Association:

Tarkington, B. (1924, May 8). [Letter to George Ade].  George Ade Papers, 1878-2007, Purdue University Archives and Special Collections (Box 10, Folder 5), Purdue University Libraries, West Lafayette, IN.

Modern Language Association:

Tarkington, Booth.  Letter to George Ade. 8 May 1924.  George Ade Papers, 1878-2007. Purdue University Archives and Special Collections, Purdue University Libraries, West Lafayette.

Chicago Manual of Style:

Booth Tarkington to George Ade, 8 May 1924, Box 10, Folder 5, George Ade Papers 1878-2007, Purdue University Archives and Special Collections, Purdue University Libraries.

Citing Electronic Sources: Amelia Earhart telegram

How to cite an electronic primary source document.

Citing a digital object:

The telegram, shown above, from the George Palmer Putnam collection of Amelia Earhart papers, 1785-1948 ,  is found online in Purdue University Archives and Special Collections' e-Archives. It is both a paper document in the collection and a digital object in e-Archives. The best way of citing this document as a digital object using one of the above formats, APA, MLA, or Chicago Manual of Style is to add the Reference URL at the end of the citation.

Reference URL: http://earchives.lib.purdue.edu/u?/earhart,3422

Cite a Website in PURDUE

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Citation Styles

Citation Styles:

The main styles used at AU are listed below.  If you need to use another style click here . Those with large research projects should strongly  consider a citation manager such as Zotero . Students can use citation generators like BibMe , Citation Machine , EasyBib  (note that all of these tools have a lot of video banner ads that automatically play) or CitationGenerator (this does not have ads)  but you must ALWAYS check your citations using the resources below:

APA (American Psychological Association)   - used in the social sciences

Chicago Manual of Style - used in the humanities and social sciences

MLA (Modern Language Association) - used in literature and the humanities

Turabian Style - a variation of the Chicago style used in many disciplines in humanities, social sciences and natural sciences ​

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COMMENTS

  1. MLA Formatting and Style Guide

    MLA is a style of documentation that may be applied to many different types of writing. Since texts have become increasingly digital, and the same document may often be found in several different sources, following a set of rigid rules no longer suffices.

  2. In-Text Citations: The Basics

    Purdue OWL Research and Citation APA Style (7th Edition) APA Formatting and Style Guide (7th Edition) In-Text Citations: The Basics APA Formatting and Style Guide (7th Edition) General Format In-Text Citations: The Basics In-Text Citations: Author/Authors Reference List: Basic Rules Reference List: Author/Authors

  3. APA Style Introduction

    APA (American Psychological Association) style is most commonly used to cite sources within the social sciences. This resource, revised according to the 7 th edition of the APA manual, offers examples for the general format of APA research papers, in-text citations, endnotes/footnotes, and the reference page.

  4. Reference List: Basic Rules

    Purdue OWL Research and Citation APA Style (7th Edition) APA Formatting and Style Guide (7th Edition) Reference List: Basic Rules APA Formatting and Style Guide (7th Edition) General Format In-Text Citations: The Basics In-Text Citations: Author/Authors Reference List: Basic Rules Reference List: Author/Authors

  5. APA vs MLA

    APA is used primarily in the (social and behavioral) sciences and in fields related to education. MLA is primarily used in humanities subjects such as languages, literary studies, and media studies. In-text citations in APA and MLA Both MLA and APA use parenthetical citations to cite sources in the text.

  6. Citation Machine®: PURDUE Format & PURDUE Citation Generator

    MLA Format: Everything You Need to Know and More Filled with a wide variety of examples and visuals, our Citation Machine® MLA guide will help you master the citation process. Learn how to cite websites, books, journal articles, magazines, newspapers, films, social media, and more!

  7. How to Cite Images

    Apply the appropriate citation style (see below for APA, MLA examples). Image creator's name (artist, photographer, etc.) Title of the image Date the image (or work represented by the image) was created Date the image was posted online Date of access (the date you accessed the online image)

  8. Citation Machine®: Format & Generate

    MLA Format: Everything You Need to Know and More Filled with a wide variety of examples and visuals, our Citation Machine® MLA guide will help you master the citation process. Learn how to cite websites, books, journal articles, magazines, newspapers, films, social media, and more!

  9. Citing Your Sources

    MLA APA CMOS - Chicago/Turabian The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material, and we provide these as a free service of the Writing Lab at Purdue. Students, members of the community, and users worldwide will find information to assist with many writing projects.

  10. Best Apps and Extensions for APA Style Citations

    This extension quickly generates sources in MLA, APA, or Chicago. It allows you to add to a bibliography with a quick click of the toolbar icon. MyBib: Free Citation Generator This simple browser extension creates APA format, MLA 8 format, and Harvard referencing style citations that can be downloaded and put into Microsoft Word.

  11. Purdue Writing Lab/Purdue OWL

    Since 1976, the Writing Lab has supported writers on the West Lafayette campus through a variety of services and community engagement initiatives using student-centered best practices. The Online Writing Lab (OWL) has been an extension of the Writing Lab since 1993, and offers global support through online reference materials and services.

  12. PDF MLA and APA Side-by-Side

    MLA and APA Side-by-Side Set-Up Bibliography Name Cover Page Font Page Margins Line Spacing MLA Works Cited No Times New Roman - 12pt 1" Double ... For more information: https://owl.english.purdue.edu/owl/ Compiled by Megan Pratt, 2015. Created Date: 3/25/2015 11:15:56 PM ...

  13. Purdue OWL MLA & APA

    APA (American Psychological Association) style is most commonly used to cite sources within the social sciences. This resource, revised according to the 6th edition, second printing of the APA manual, offers examples for the general format of APA research papers, in-text citations, endnotes/footnotes, and the reference page.

  14. Primary Sources in Archives & Special Collections

    You may wish to consult the Purdue Online Writing Lab (OWL) for further information. The particular style may be the American Psychological Assocaition (APA), the Modern Language Association (MLA), the Chicago Manual of Style, etc. ... APA, MLA, or Chicago Manual of Style is to add the Reference URL at the end of the citation. Reference URL ...

  15. Citing a Website in PURDUE

    Create manual citation Don't let plagiarism errors spoil your paper Scan your paper for plagiarism mistakes Get help for 7,000+ citation styles including APA 6 Check for 400+ advanced grammar errors Create in-text citations and save them Free 3-day trial. Cancel anytime.*️ Try Citation Machine® Plus! *See Terms and Conditions

  16. OWLPurdue

    This channel is the official YouTube channel for the Purdue Online Writing Lab (OWL). You are free to link to these videos for your own educational purposes as long as you follow the OWL's Fair ...

  17. Subject Guides: Citation Style Guide: APA, MLA, Chicago, Turabian

    Publication Manual of the American Psychological Association: The Official Guide to APA Style 7th edition (Call number: Course Reserves BF76.7 .P83 2020.) Recommended - Purdue OWL APA Style - Includes a tutorial for citing in APA style as well as sample papers and bibliographies. Chicago Manual of Style - used in the humanities and social ...