How to Cite Online Forums, Reddit, and Wikipedia in Academic Work

Key Takeaways

• Wikipedia: Cite as a reference work entry using the article title as author. Always link to the archived permalink, not the current page.
• Reddit/Forum Posts: Use the real name (if known) or username as author, title of post, and direct URL. Truncate long titles to the first 20 words.
• Forum Comments: Format as a comment on a forum post, linking directly to the specific reply rather than the main thread.
• Style matters: APA requires (Author, Year) in-text; MLA uses “Author, Date” in Works Cited; Chicago offers flexible footnotes or author-date formats.
• Verify with your instructor: Many professors discourage Wikipedia and informal forums as primary sources, even when properly cited.

You found a great Reddit thread that directly addresses your research question. You stumbled on a Wikipedia summary that perfectly frames your literature review. The information is useful, but your professor’s guidelines require academic citations—and you have no idea how to format them.

This happens more often than most students realize. Online forums, social platforms, and collaborative wikis are increasingly part of the research ecosystem. The APA Style guidelines themselves recognize them as valid source types, with dedicated sections in both the Publication Manual and the Concise Guide.

The good news? The citation rules are straightforward once you know the pattern. This guide walks you through exactly how to cite Reddit posts, Wikipedia articles, and online forum comments in all three major citation styles—APA 7th, MLA 9th, and Chicago 17th—with real examples you can copy and adapt.

We’ll also cover the decisions that trip people up: what to do when there’s no date, how to handle anonymous usernames, and why citing the archived version matters more than most students think.

What Counts as a Forum or Wiki Source?

Before you can cite something properly, you need to know what falls into this category. Online forums and wikis share two defining features: user-generated content and frequently changing pages.

Wikipedia and Other Wikis

Wiki platforms let anyone edit the page at any time. That means the version you read today may not be the version anyone else will find tomorrow. This volatility is the core reason wiki citations differ from standard webpage citations.

Wikipedia is the biggest example, but the same rules apply to:

• Wiktionary (dictionary definitions)
• Wikibooks (open textbooks)
• Wikisource (historical documents)
• Any wiki-hosted content (including institutional wikis)

Reddit and Online Discussion Forums

Reddit is the most prominent forum, but the rules apply to any user-posted content on discussion platforms:

• Reddit posts and comments (any subreddit)
• Stack Overflow (programming Q&A)
• Google Groups ( mailing-list discussions)
• Student.universities.edu forums (academic discussion boards)
• Special Interest Forum sites (health, finance, hobby communities)

The key distinction: if the content is user-generated and posted on a discussion platform, you’re dealing with a forum post or forum comment—not a traditional webpage.

Why This Citation Format Is Different

Standard webpages are cited as:

Author. (Year, Month Date). Title of page. Site Name. URL

Wiki and forum citations deviate because of the sources’ unstable nature and community-driven authorship. The APA manual places wiki entries in Section 10.3 (reference works) and forum posts in Section 10.15 (social media, online forums). MLA puts them in Chapter 5 (digital sources). Chicago’s 17th edition covers them in the online sources chapter.

The deviations exist to solve three problems:

1. Attribution uncertainty: Usernames, not real names, are usually the authors
2. Version volatility: The cited page may change after you finish writing
3. Content decay: Forum posts can be deleted, moved, or edited by moderators

Each style handles these problems slightly differently. Let’s look at how.

How to Cite Wikipedia in APA, MLA, and Chicago

Wikipedia in APA 7th Edition

Wikipedia is treated as a reference work entry, not a standard webpage. The article title goes in the author position.

Format:

Article Title. (Year, Month Day). In Wikipedia. Archived URL

Example:

Climate change. (2026, June 1). In Wikipedia. https://en.wikipedia.org/w/index.php?title=Climate_change&oldid=1234567890

In-text citation:

• Parenthetical: (“Climate change,” 2026)
• Narrative: “Climate change” (2026)

Important: Always use the archived permalink, not the live URL. Go to “View History” on the Wikipedia page, select the date of the version you read, and copy the URL from the browser address bar. This ensures your reader can access the exact version you cited.

Wikipedia in MLA 9th Edition

MLA treats Wikipedia as a crowdsourced reference work. The article title is the author; the date is the revision date of the cited version.

Format:

Article Title. Last modified Month Day, Year. Wikipedia, URL.

Example:

Climate change. Last modified 1 June 2026. Wikipedia, https://en.wikipedia.org/w/index.php?title=Climate_change&oldid=1234567890.

In-text citation:

• (“Climate change”)

Wikipedia in Chicago 17th Edition

Chicago uses an author-date format for wikis similar to APA, with a slight variation in punctuation.

Bibliography format:

Article Title, Month Day, Year, Wikipedia, https://en.wikipedia.org/w/index.php?title=Climate_change&oldid=1234567890.

Footnote:

1. Article Title, Month Day, Year, Wikipedia, https://en.wikipedia.org/w/index.php?title=Climate_change&oldid=1234567890.

In-text:

• (Article Title 2026)

Wikipedia: A Real-World Example

Imagine you used the article “Genetic Engineering” to support a paragraph in your biology essay. You read the version on March 20, 2025, which had an archived ID ending in 987654321. Your APA reference list entry would look like this:

Genetic engineering. (2025, March 20). In Wikipedia. https://en.wikipedia.org/w/index.php?title=Genetic_engineering&oldid=987654321

And your in-text citation would be:

(“Genetic engineering,” 2025)

⚠️ Important Note: APA Style itself says: “If you are a student, ask your professor whether Wikipedia is an appropriate source for you to use in your paper. Wikipedia reports information from other sources, making it a secondary source. Many professors prefer that students cite primary sources.”^[1]

So while Wikipedia is perfectly valid to cite, it’s a secondary source. It’s best used for background context, not as the foundation of your argument. Always look for the original research that the Wikipedia article references and cite that instead when possible.

How to Cite Reddit Posts and Forum Threads

Reddit Post in APA 7th Edition

A Reddit post follows the online forum post format. The author is either the real name or the username. The title is truncated to the first 20 words.

Format:

Author Last Name, First Initial. [Username]. (Year, Month Day). Title of post or thread [Online forum post]. Forum Name. URL

Example with real name:

Smith, J. [DataNerd42]. (2025, October 15). The debate over AI ethics in higher education has been going on for years [Online forum post]. Reddit. https://www.reddit.com/r/Education/comments/abc123/

Example with username only:

u/DataNerd42. (2025, October 15). The debate over AI ethics in higher education has been going on for years [Online forum post]. Reddit. https://www.reddit.com/r/Education/comments/abc123/

In-text citation:

• Parenthetical: (Smith, 2025) or (u/DataNerd42, 2025)
• Narrative: Smith (2025) or u/DataNerd42 (2025)

Reddit Post in MLA 9th Edition

Format:

Username. “Title of Post.” Reddit, Day Month Year, URL.

Example:

u/DataNerd42. “The Debate Over AI Ethics in Higher Education Has Been Going On for Years.” Reddit, 15 Oct. 2025, www.reddit.com/r/Education/comments/abc123/.

In-text citation:

• (u/DataNerd42)

Reddit Post in Chicago 17th Edition

Bibliography format:

Username. “Title of Post.” Reddit, Month Day, Year. URL.

Footnote:

1. Username, “Title of Post,” Reddit, Month Day, Year, URL.

Example:

1. u/DataNerd42, “The Debate Over AI Ethics in Higher Education Has Been Going On for Years,” Reddit, October 15, 2025, www.reddit.com/r/Education/comments/abc123/.

In-text:

• (u/DataNerd42 2025)

Reddit Post: The 20-Word Rule

APA Style requires that the title in the reference list be up to the first 20 words of the post. If the original title is longer, truncate it and add “[Online forum post]” at the end.

For example, if a Reddit post title is 30 words long, APA says:

Smith, J. [DataNerd42]. (2025, October 15). The debate over AI ethics in higher education has been going on for years now [Online forum post]. Reddit. https://www.reddit.com/r/Education/comments/abc123/

Notice that only the first 20 words appear, followed by the bracketed label. MLA and Chicago use the full title, not truncated.

How to Cite Reddit Comments and Forum Replies

Reddit Comment in APA 7th Edition

Comments are cited differently from posts. APA marks them as “Comment on the online forum post” with the thread title in brackets.

Format:

Author. (Year, Month Day). First 20 words of comment [Comment on the online forum post]. Title of Reddit Thread, comment on r/Subreddit [Online forum]. Reddit. Comment URL

Example:

u/DataNerd42. (2025, October 16). This approach has consistently yielded better results when balancing [Comment on the online forum post]. The Debate Over AI Ethics in Higher Education, comment on r/Education [Online forum]. Reddit. https://www.reddit.com/r/Education/comments/abc123/dea82mk/

In-text citation:

• Parenthetical: (u/DataNerd42, 2025)
• Narrative: u/DataNerd42 (2025)

Reddit Comment in MLA 9th Edition

Format:

Username. “Comment on Thread Title.” Reddit, Day Month Year, Comment URL.

Example:

u/DataNerd42. “Comment on The Debate Over AI Ethics in Higher Education.” Reddit, 16 Oct. 2025, www.reddit.com/r/Education/comments/abc123/dea82mk/.

Reddit Comment in Chicago 17th Edition

Bibliography:

Username. “Comment on ‘Thread Title’.” Reddit, Month Day, Year. Comment URL.

Footnote:

1. Username, “Comment on ‘Thread Title’,” Reddit, Month Day, Year, Comment URL.

Why the Comment URL Matters

When citing a comment, always use the permalink to the specific comment, not the main post URL. On Reddit, click the date stamp of the comment to get the direct link. This is non-negotiable—APA Style explicitly requires it.

The comment URL follows this pattern:

https://www.reddit.com/r/Subreddit/comments/PostID/CommentID/

The comment ID (the long alphanumeric string at the end) is what makes the link work.

Edge Cases and Common Problems

Every citation system has quirks. Here’s how to handle them.

No Author Name Available

If a forum post has no username and no real name, use the post title as the author:

APA:

Title of Post. (Year, Month Day). [Online forum post]. Forum Name. URL

MLA:

Title of Post. Forum Name, Day Month Year. URL.

No Date Available

APA: Use (n.d.) for “no date”:

u/DataNerd42. (n.d.). The debate over AI ethics [Online forum post]. Reddit.

MLA and Chicago: Skip the date or add “Accessed Month Day, Year.”

Anonymous Posts ([deleted] or [removed])

If a post has been deleted, APA says to use [deleted] as the author:

[deleted]. (2025, October 15). Deleted content [Online forum post]. Reddit. https://www.reddit.com/r/Example/comments/abc123/

⚠️ Caution: A deleted post is not a reliable source. If the content you’re citing has been removed, consider whether the claim is still verifiable.

Multiple Authors

If a forum post has multiple authors listed, cite the first one and use “et al.”:

Smith, J., Brown, K., & Wilson, L. [DataNerd42]. (2025, October 15). Multi-author forum post [Online forum post]. Reddit.

Long Titles (Beyond 20 Words in APA)

For APA, the first 20 words of the post title go in the reference list. If the title is extremely long or unclear, you can use the bracketed label to clarify:

The first twenty words of the original title that exceeds twenty words in length [Online forum post]. Reddit.

Citing a YouTube Video Comment on Reddit

If you’re citing a Reddit post that links to a YouTube video, cite the YouTube video itself, not the Reddit discussion. The YouTube citation format is:

Username. (Year, Month Date). Title of video [Video]. YouTube. URL

Citing the Reddit post about the video instead adds an unnecessary layer of indirectness.

When to Cite and When to Skip

Just because you can cite a Reddit thread doesn’t mean you should. Here’s a quick decision framework.

Citworthy Sources

Sources to Avoid

The Verifiable Principle

If you can verify the contributor’s identity and expertise—through a real name, institutional affiliation, or credential—the source is citeworthy. If the author is anonymous and the content is opinion-driven, skip it.

Practical Checklist Before Submission

Use this list to catch common citation errors.

• [ ] Author: Real name or username? Include both if available.
• [ ] Date: Year, month, and day for APA. Month and day for MLA/Chicago.
• [ ] Title: Truncated to 20 words if APA. Full title if MLA/Chicago.
• [ ] Type label: “[Online forum post]” or “[Comment on the online forum post]” for APA.
• [ ] Forum name: Reddit, Stack Overflow, Wikipedia (in Wikipedia), etc.
• [ ] URL: Direct link to the specific post/comment/wiki version.
• [ ] Permalink: Wikipedia archived URL; Reddit comment permalink.
• [ ] Style consistency: Did you pick one citation style and use it throughout?
• [ ] In-text match: Does every in-text citation have a matching reference list entry?
• [ ] Professor approval: Did you check whether your instructor allows these sources?

Common Mistakes Students Make

Based on analysis of writing center feedback and university plagiarism case studies, here are the most frequent citation errors:

1. Using the live URL instead of the archived permalink for Wikipedia. Anyone looking up your reference will find a potentially different version.
2. Citing Reddit comments with the main post URL instead of the comment permalink. This makes the citation unverifiable.
3. Mixing citation styles within the same paper. Pick one—APA, MLA, or Chicago—and stick with it.
4. Skipping the “[Online forum post]” bracket in APA. It’s required by the manual.
5. Using “Retrieved from” unnecessarily in APA 7th. APA dropped the retrieval-date requirement for webpages in 7th edition. Only use it for unarchived sources.
6. Citing deleted posts without noting “[deleted]” or questioning the source’s reliability.
7. Assuming all forums are acceptable sources. Many professors prefer primary, peer-reviewed materials.

How to Choose Between APA, MLA, and Chicago

You don’t need to cite in all three styles. You need to cite in the style your instructor requires. Here’s a quick comparison:

Rule of thumb: If you’re in psychology, use APA. If you’re in English or literature, use MLA. If you’re in history or a business school, Chicago is common—but always check with your instructor.

Related Guides

• Academic Citation Styles: APA, MLA, Chicago, Harvard – Complete Guide
• How to Paraphrase Correctly: Step-by-Step Techniques with Examples
• How to Properly Attribute Sources: A Complete Guide to Avoiding Plagiarism
• Peer Review Process: A Complete Guide for Researchers and Reviewers

Summary: Your Citation Cheat Sheet

The rules boil down to five principles:

1. Wikipedia = reference work → Title as author, “In Wikipedia,” archived permalink.
2. Reddit post = online forum post → Real name or username, title truncated to 20 words (APA), direct post URL.
3. Reddit comment = comment on forum post → Username, first 20 words of comment, thread title, direct comment permalink.
4. Always use perma-links → Wikipedia archived version; Reddit comment permalink.
5. Verify with your instructor → Many prefer primary sources over forums and wikis.

Pick your style. Follow the format. Double-check the URL. If you do that, your citations will be clean, verifiable, and academically honest.

Need help with your citations? Run your finished paper through our plagiarism checker to make sure all sources are properly attributed and your originality is solid. Get a detailed similarity report and catch any accidental citation gaps before submission.