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How to Cite Sources | Citation Generator & Quick Guide

Citing your sources is essential in  academic writing . Whenever you quote or paraphrase a source (such as a book, article, or webpage), you have to include a  citation crediting the original author.

Failing to properly cite your sources counts as plagiarism , since you’re presenting someone else’s ideas as if they were your own.

The most commonly used citation styles are APA and MLA. The free Scribbr Citation Generator is the quickest way to cite sources in these styles. Simply enter the URL, DOI, or title, and we’ll generate an accurate, correctly formatted citation.

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Table of contents

When do you need to cite sources, which citation style should you use, in-text citations, reference lists and bibliographies.

Scribbr Citation Generator

Other useful citation tools

Citation examples and full guides, frequently asked questions about citing sources.

Citations are required in all types of academic texts. They are needed for several reasons:

• To avoid plagiarism by indicating when you’re taking information from another source
• To give proper credit to the author of that source
• To allow the reader to consult your sources for themselves

A citation is needed whenever you integrate a source into your writing. This usually means quoting or paraphrasing:

• To quote a source , copy a short piece of text word for word and put it inside quotation marks .
• To paraphrase a source , put the text into your own words. It’s important that the paraphrase is not too close to the original wording. You can use the paraphrasing tool if you don’t want to do this manually.

Citations are needed whether you quote or paraphrase, and whatever type of source you use. As well as citing scholarly sources like books and journal articles, don’t forget to include citations for any other sources you use for ideas, examples, or evidence. That includes websites, YouTube videos , and lectures .

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Usually, your institution (or the journal you’re submitting to) will require you to follow a specific citation style, so check your guidelines or ask your instructor.

In some cases, you may have to choose a citation style for yourself. Make sure to pick one style and use it consistently:

• APA Style is widely used in the social sciences and beyond.
• MLA style is common in the humanities.
• Chicago notes and bibliography , common in the humanities
• Chicago author-date , used in the (social) sciences
• There are many other citation styles for different disciplines.

If in doubt, check with your instructor or read other papers from your field of study to see what style they follow.

In most styles, your citations consist of:

• Brief in-text citations at the relevant points in the text
• A reference list or bibliography containing full information on all the sources you’ve cited

In-text citations most commonly take the form of parenthetical citations featuring the last name of the source’s author and its year of publication (aka author-date citations).

An alternative to this type of in-text citation is the system used in numerical citation styles , where a number is inserted into the text, corresponding to an entry in a numbered reference list.

There are also note citation styles , where you place your citations in either footnotes or endnotes . Since they’re not embedded in the text itself, these citations can provide more detail and sometimes aren’t accompanied by a full reference list or bibliography.

A reference list (aka “Bibliography” or “Works Cited,” depending on the style) is where you provide full information on each of the sources you’ve cited in the text. It appears at the end of your paper, usually with a hanging indent applied to each entry.

The information included in reference entries is broadly similar, whatever citation style you’re using. For each source, you’ll typically include the:

• Author name
• Publication date
• Container (e.g., the book an essay was published in, the journal an article appeared in)
• Location (e.g., a URL or DOI , or sometimes a physical location)

The exact information included varies depending on the source type and the citation style. The order in which the information appears, and how you format it (e.g., capitalization, use of italics) also varies.

Most commonly, the entries in your reference list are alphabetized by author name. This allows the reader to easily find the relevant entry based on the author name in your in-text citation.

In numerical citation styles, the entries in your reference list are numbered, usually based on the order in which you cite them. The reader finds the right entry based on the number that appears in the text.

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The AI-powered Citation Checker helps you avoid common mistakes such as:

• Missing commas and periods
• Incorrect usage of “et al.”
• Ampersands (&) in narrative citations
• Missing reference entries

Because each style has many small differences regarding things like italicization, capitalization , and punctuation , it can be difficult to get every detail right. Using a citation generator can save you a lot of time and effort.

Scribbr offers citation generators for both APA and MLA style. Both are quick, easy to use, and 100% free, with no ads and no registration required.

Just input a URL or DOI or add the source details manually, and the generator will automatically produce an in-text citation and reference entry in the correct format. You can save your reference list as you go and download it when you’re done, and even add annotations for an annotated bibliography .

Once you’ve prepared your citations, you might still be unsure if they’re correct and if you’ve used them appropriately in your text. This is where Scribbr’s other citation tools and services may come in handy:

Plagiarism Checker

Citation Checker

Citation Editing

Plagiarism means passing off someone else’s words or ideas as your own. It’s a serious offense in academia. Universities use plagiarism checking software to scan your paper and identify any similarities to other texts.

When you’re dealing with a lot of sources, it’s easy to make mistakes that could constitute accidental plagiarism. For example, you might forget to add a citation after a quote, or paraphrase a source in a way that’s too close to the original text.

Using a plagiarism checker yourself before you submit your work can help you spot these mistakes before they get you in trouble. Based on the results, you can add any missing citations and rephrase your text where necessary.

Try out the Scribbr Plagiarism Checker for free, or check out our detailed comparison of the best plagiarism checkers available online.

Scribbr Plagiarism Checker

Scribbr’s Citation Checker is a unique AI-powered tool that automatically detects stylistic errors and inconsistencies in your in-text citations. It also suggests a correction for every mistake.

Currently available for APA Style, this is the fastest and easiest way to make sure you’ve formatted your citations correctly. You can try out the tool for free below.

If you need extra help with your reference list, we also offer a more in-depth Citation Editing Service.

Our experts cross-check your in-text citations and reference entries, make sure you’ve included the correct information for each source, and improve the formatting of your reference page.

If you want to handle your citations yourself, Scribbr’s free Knowledge Base provides clear, accurate guidance on every aspect of citation. You can see citation examples for a variety of common source types below:

And you can check out our comprehensive guides to the most popular citation styles:

At college level, you must properly cite your sources in all essays , research papers , and other academic texts (except exams and in-class exercises).

Add a citation whenever you quote , paraphrase , or summarize information or ideas from a source. You should also give full source details in a bibliography or reference list at the end of your text.

The exact format of your citations depends on which citation style you are instructed to use. The most common styles are APA , MLA , and Chicago .

The abbreviation “ et al. ” (Latin for “and others”) is used to shorten citations of sources with multiple authors.

“Et al.” is used in APA in-text citations of sources with 3+ authors, e.g. (Smith et al., 2019). It is not used in APA reference entries .

Use “et al.” for 3+ authors in MLA in-text citations and Works Cited entries.

Use “et al.” for 4+ authors in a Chicago in-text citation , and for 10+ authors in a Chicago bibliography entry.

The Scribbr Citation Generator is developed using the open-source Citation Style Language (CSL) project and Frank Bennett’s citeproc-js . It’s the same technology used by dozens of other popular citation tools, including Mendeley and Zotero.

You can find all the citation styles and locales used in the Scribbr Citation Generator in our publicly accessible repository on Github .

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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MLA Works Cited: Electronic Sources (Web Publications)

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

The MLA Handbook highlights principles over prescriptive practices. Essentially, a writer will need to take note of primary elements in every source, such as author, title, etc. and then assort them in a general format. Thus, by using this methodology, a writer will be able to cite any source regardless of whether it’s included in this list.

However, this guide will highlight a few concerns when citing digital sources in MLA style.

Best Practices for Managing Online Sources

Because online information can change or disappear, it is always a good idea to keep personal copies of important electronic information whenever possible. Downloading or even printing key documents ensures you have a stable backup. You can also use the Bookmark function in your web browser in order to build an easy-to-access reference for all of your project's sources (though this will not help you if the information is changed or deleted).

It is also wise to keep a record of when you first consult with each online source. MLA uses the phrase, “Accessed” to denote which date you accessed the web page when available or necessary. It is not required to do so, but it is encouraged (especially when there is no copyright date listed on a website).

Important Note on the Use of URLs in MLA

Include a URL or web address to help readers locate your sources. Because web addresses are not static (i.e., they change often) and because documents sometimes appear in multiple places on the web (e.g., on multiple databases), MLA encourages the use of citing containers such as Youtube, JSTOR, Spotify, or Netflix in order to easily access and verify sources. However, MLA only requires the www. address, so eliminate all https:// when citing URLs.

Many scholarly journal articles found in databases include a DOI (digital object identifier). If a DOI is available, cite the DOI number instead of the URL.

Online newspapers and magazines sometimes include a “permalink,” which is a shortened, stable version of a URL. Look for a “share” or “cite this” button to see if a source includes a permalink. If you can find a permalink, use that instead of a URL.

Abbreviations Commonly Used with Electronic Sources

If page numbers are not available, use par. or pars. to denote paragraph numbers. Use these in place of the p. or pp. abbreviation. Par. would be used for a single paragraph, while pars. would be used for a span of two or more paragraphs.

Basic Style for Citations of Electronic Sources (Including Online Databases)

Here are some common features you should try to find before citing electronic sources in MLA style. Not every web page will provide all of the following information. However, collect as much of the following information as possible:

• Author and/or editor names (if available); last names first.
• "Article name in quotation marks."
• Title of the website, project, or book in italics.
• Any version numbers available, including editions (ed.), revisions, posting dates, volumes (vol.), or issue numbers (no.).
• Publisher information, including the publisher name and publishing date.
• Take note of any page numbers (p. or pp.) or paragraph numbers (par. or pars.).
• DOI (if available, precede it with "https://doi.org/"), otherwise a URL (without the https://) or permalink.
• Date you accessed the material (Date Accessed). While not required, saving this information it is highly recommended, especially when dealing with pages that change frequently or do not have a visible copyright date.

Use the following format:

Author. "Title." Title of container (self contained if book) , Other contributors (translators or editors), Version (edition), Number (vol. and/or no.), Publisher, Publication Date, Location (pages, paragraphs and/or URL, DOI or permalink). 2 nd container’s title , Other contributors, Version, Number, Publisher, Publication date, Location, Date of Access (if applicable).

Citing an Entire Web Site

When citing an entire website, follow the same format as listed above, but include a compiler name if no single author is available.

Author, or compiler name (if available). Name of Site. Version number (if available), Name of institution/organization affiliated with the site (sponsor or publisher), date of resource creation (if available), DOI (preferred), otherwise include a URL or permalink. Date of access (if applicable).

Editor, author, or compiler name (if available). Name of Site . Version number, Name of institution/organization affiliated with the site (sponsor or publisher), date of resource creation (if available), URL, DOI or permalink. Date of access (if applicable).

The Purdue OWL Family of Sites . The Writing Lab and OWL at Purdue and Purdue U, 2008, owl.english.purdue.edu/owl. Accessed 23 Apr. 2008.

Felluga, Dino. Guide to Literary and Critical Theory . Purdue U, 28 Nov. 2003, www.cla.purdue.edu/english/theory/. Accessed 10 May 2006.

Course or Department Websites

Give the instructor name. Then list the title of the course (or the school catalog designation for the course) in italics. Give appropriate department and school names as well, following the course title.

Felluga, Dino. Survey of the Literature of England . Purdue U, Aug. 2006, web.ics.purdue.edu/~felluga/241/241/Home.html. Accessed 31 May 2007.

English Department . Purdue U, 20 Apr. 2009, www.cla.purdue.edu/english/. Accessed 31 May 2015.

A Page on a Web Site

For an individual page on a Web site, list the author or alias if known, followed by an indication of the specific page or article being referenced. Usually, the title of the page or article appears in a header at the top of the page. Follow this with the information covered above for entire Web sites. If the publisher is the same as the website name, only list it once.

Lundman, Susan. “How to Make Vegetarian Chili.”  eHow , www.ehow.com/how_10727_make-vegetarian-chili.html. Accessed 6 July 2015.

“ Athlete's Foot - Topic Overview. ”   WebMD , 25 Sept. 2014, www.webmd.com/skin-problems-and-treatments/tc/athletes-foot-topic-overview.

Citations for e-books closely resemble those for physical books. Simply indicate that the book in question is an e-book by putting the term "e-book" in the "version" slot of the MLA template (i.e., after the author, the title of the source, the title of the container, and the names of any other contributors).

Silva, Paul J.  How to Write a Lot: A Practical Guide to Productive Academic Writing. E-book, American Psychological Association, 2007.

If the e-book is formatted for a specific reader device or service, you can indicate this by treating this information the same way you would treat a physical book's edition number. Often, this will mean replacing "e-book" with "[App/Service] ed."

Machiavelli, Niccolo.  The Prince , translated by W. K. Marriott, Kindle ed., Library of Alexandria, 2018.

Note:  The MLA considers the term "e-book" to refer to publications formatted specifically for reading with an e-book reader device (e.g., a Kindle) or a corresponding web application. These e-books will not have URLs or DOIs. If you are citing book content from an ordinary webpage with a URL, use the "A Page on a Web Site" format above.

An Image (Including a Painting, Sculpture, or Photograph)

Provide the artist's name, the work of art italicized, the date of creation, the institution and city where the work is housed. Follow this initial entry with the name of the Website in italics, and the date of access.

Goya, Francisco. The Family of Charles IV . 1800. Museo Nacional del Prado, Madrid. Museo Nacional del Prado , www.museodelprado.es/en/the-collection/art-work/the-family-of-carlos-iv/f47898fc-aa1c-48f6-a779-71759e417e74. Accessed 22 May 2006.

Klee, Paul. Twittering Machine . 1922. Museum of Modern Art, New York. The Artchive , www.artchive.com/artchive/K/klee/twittering_machine.jpg.html. Accessed May 2006.

If the work cited is available on the web only, then provide the name of the artist, the title of the work, and then follow the citation format for a website. If the work is posted via a username, use that username for the author.

Adams, Clifton R. “People Relax Beside a Swimming Pool at a Country Estate Near Phoenix, Arizona, 1928.” Found, National Geographic Creative, 2 June 2016, natgeofound.tumblr.com/.

An Article in a Web Magazine

Provide the author name, article name in quotation marks, title of the web magazine in italics, publisher name, publication date, URL, and the date of access.

Bernstein, Mark. “ 10 Tips on Writing the Living Web. ”   A List Apart: For People Who Make Websites , 16 Aug. 2002, alistapart.com/article/writeliving. Accessed 4 May 2009.

An Article in an Online Scholarly Journal

For all online scholarly journals, provide the author(s) name(s), the name of the article in quotation marks, the title of the publication in italics, all volume and issue numbers, and the year of publication. Include a DOI if available, otherwise provide a URL or permalink to help readers locate the source.

Article in an Online-only Scholarly Journal

MLA requires a page range for articles that appear in Scholarly Journals. If the journal you are citing appears exclusively in an online format (i.e. there is no corresponding print publication) that does not make use of page numbers, indicate the URL or other location information.

Dolby, Nadine. “Research in Youth Culture and Policy: Current Conditions and Future Directions.” Social Work and Society: The International Online-Only Journal, vol. 6, no. 2, 2008, www.socwork.net/sws/article/view/60/362. Accessed 20 May 2009.

Article in an Online Scholarly Journal That Also Appears in Print

Cite articles in online scholarly journals that also appear in print as you would a scholarly journal in print, including the page range of the article . Provide the URL and the date of access.

Wheelis, Mark. “ Investigating Disease Outbreaks Under a Protocol to the Biological and Toxin Weapons Convention. ”   Emerging Infectious Diseases , vol. 6, no. 6, 2000, pp. 595-600, wwwnc.cdc.gov/eid/article/6/6/00-0607_article. Accessed 8 Feb. 2009.

An Article from an Online Database (or Other Electronic Subscription Service)

Cite online databases (e.g. LexisNexis, ProQuest, JSTOR, ScienceDirect) and other subscription services as containers. Thus, provide the title of the database italicized before the DOI or URL. If a DOI is not provided, use the URL instead. Provide the date of access if you wish.

Alonso, Alvaro, and Julio A. Camargo. “ Toxicity of Nitrite to Three Species of Freshwater Invertebrates. ”   Environmental Toxicology, vol. 21, no. 1, 3 Feb. 2006, pp. 90-94. Wiley Online Library , https://doi.org/10.1002/tox.20155. Accessed 26 May 2009.

Langhamer, Claire. “Love and Courtship in Mid-Twentieth-Century England.” Historical Journal, vol. 50, no. 1, 2007, pp. 173-96. ProQuest , https://doi.org/10.1017/S0018246X06005966. Accessed 27 May 2009.

E-mail (including E-mail Interviews)

Give the author of the message, followed by the subject line in quotation marks. State to whom the message was sent with the phrase, “Received by” and the recipient’s name. Include the date the message was sent. Use standard capitalization.

Kunka, Andrew. “ Re: Modernist Literature. ”  Received by John Watts, 15 Nov. 2000.

Neyhart, David. “ Re: Online Tutoring. ” Received by Joe Barbato, 1 Dec. 2016.

A Listserv, Discussion Group, or Blog Posting

Cite web postings as you would a standard web entry. Provide the author of the work, the title of the posting in quotation marks, the web site name in italics, the publisher, and the posting date. Follow with the date of access. Include screen names as author names when author name is not known. If both names are known, place the author’s name in brackets.

Author or compiler name (if available). “Posting Title.” Name of Site , Version number (if available), Name of institution/organization affiliated with the site (sponsor or publisher), URL. Date of access.

Salmar1515 [Sal Hernandez]. “Re: Best Strategy: Fenced Pastures vs. Max Number of Rooms?” BoardGameGeek , 29 Sept. 2008, boardgamegeek.com/thread/343929/best-strategy-fenced-pastures-vs-max-number-rooms. Accessed 5 Apr. 2009.

Begin with the user's Twitter handle in place of the author’s name. Next, place the tweet in its entirety in quotations, inserting a period after the tweet within the quotations. Include the date and time of posting, using the reader's time zone; separate the date and time with a comma and end with a period. Include the date accessed if you deem necessary.

@tombrokaw. “ SC demonstrated why all the debates are the engines of this campaign. ”   Twitter, 22 Jan. 2012, 3:06 a.m., twitter.com/tombrokaw/status/160996868971704320.

@PurdueWLab. “ Spring break is around the corner, and all our locations will be open next week. ”   Twitter , 5 Mar. 2012, 12:58 p.m., twitter.com/PurdueWLab/status/176728308736737282.

A YouTube Video

Video and audio sources need to be documented using the same basic guidelines for citing print sources in MLA style. Include as much descriptive information as necessary to help readers understand the type and nature of the source you are citing. If the author’s name is the same as the uploader, only cite the author once. If the author is different from the uploader, cite the author’s name before the title.

McGonigal, Jane. “Gaming and Productivity.” YouTube , uploaded by Big Think, 3 July 2012, www.youtube.com/watch?v=mkdzy9bWW3E.

“8 Hot Dog Gadgets put to the Test.” YouTube, uploaded by Crazy Russian Hacker, 6 June 2016, www.youtube.com/watch?v=WBlpjSEtELs.

A Comment on a Website or Article

List the username as the author. Use the phrase, Comment on, before the title. Use quotation marks around the article title. Name the publisher, date, time (listed on near the comment), and the URL.

Not Omniscient Enough. Comment on “ Flight Attendant Tells Passenger to ‘Shut Up’ After Argument Over Pasta. ”  ABC News, 9 Jun 2016, 4:00 p.m., abcnews.go.com/US/flight-attendant-tells-passenger-shut-argument-pasta/story?id=39704050.

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