"[Citation needed]" is a tag added by Wikipedia editors to unsourced statements in articles requesting citations to be added. The phrase is reflective of the policies of verifiability and no original research on Wikipedia and has become a general Internet meme.
Usage on Wikipedia
The tag was first used on Wikipedia in 2006. By Wikipedia policy, editors should add citations for content, to ensure accuracy and neutrality, and to avoid original research. The citation needed tag is used to mark statements that lack such citations. As of February 2019[update], there were more than 350,000 pages on Wikipedia containing at least one instance of the tag. Users who click the tag will be directed to pages about Wikipedia's verifiability policy and its application using the tag.
Usage outside Wikipedia
In 2010, American television hosts Jon Stewart and Stephen Colbert led the Rally to Restore Sanity and/or Fear at the National Mall in Washington, D.C., where some participants held placards with "".
The subdomain of citation download for Springer Nature journals is "citation-needed", e.g., https://citation-needed.springer.com/v2/references/10.1038/nature14539?format=refman&flavour=citation .
From 2014 to 2018, Tom Scott, Chris Joel, Gary Brannan and Matt Gray a.k.a. 'The Technical Difficulties' had a YouTube panel show titled "Citation Needed". Will Seaward and Matt Parker also featured as guest panelists in episodes 6x03, 6x04, 7x03 and 7x04 standing in for Gray.
- Redi, Miriam; Fetahu, Besnik; Morgan, Jonathan; Taraborelli, Dario (13 May 2019). Citation Needed: A Taxonomy and Algorithmic Assessment of Wikipedia's Verifiability. WWW '19. San Francisco, CA, USA: Association for Computing Machinery. pp. 1567–1578. doi:10.1145/3308558.3313618. ISBN 978-1-4503-6674-8. S2CID 67856117.
- McDowell, Zachary J.; Vetter, Matthew A. (2022). "What Counts as Information: The Construction of Reliability and Verifability". Wikipedia and the Representation of Reality. Routledge, Taylor & Francis. p. 34. doi:10.4324/9781003094081. ISBN 978-1-000-47427-5.
- 栗岡 幹英 [Masahide Kurioka] (2010-03-01). "インターネットは言論の公共圏たりうるか：ブログとウィキペディアの内容分析" [Can the Internet be the Public Sphere of Discourse? : Contents Analysis of Blog and Wikipedia]. 奈良女子大学社会学論集 [Nara Women's University Sociological Studies] (in Japanese). 奈良女子大学社会学研究会 [Nara Women's University Sociological Study Group] (17): 133–151. ISSN 1340-4032.
- McDowell, Zachary J.; Vetter, Matthew A. (July 2020). "It Takes a Village to Combat a Fake News Army: Wikipedia's Community and Policies for Information Literacy". Social Media + Society. 6 (3). doi:10.1177/2056305120937309. ISSN 2056-3051. S2CID 222110748.
- Glenn, Joshua (2008-01-02). "". The Boston Globe. Archived from the original on 2018-07-27. Retrieved 2018-07-27.
- Johnson, Ted (2010-11-01). "Satirical rally calls for sanity and/or fear". Variety. Archived from the original on 2010-11-16. Retrieved 2018-07-27.
- Munroe, Randall (2014). What If? Serious Scientific Answers to Absurd Hypothetical Questions. Hachette UK. ISBN 9780544272644. Retrieved 2021-06-15.
- Hill, Kyle (2014-09-02). "Review: XKCD's What If?". Nerdist. Retrieved 2021-07-12.
- Poole, Steven (2019-09-19). "Book Review: 'What If' by Randall Munroe". The Wall Street Journal. Retrieved 2021-07-12.
- Scott, Tom (October 3, 2019). "Citation Needed, from the Technical Difficulties". Archived from the original on May 6, 2022. Retrieved 2022-05-11 – via YouTube.