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This suggests that the accuracy of Wikipedia is high. However, the results should not be seen as support for Wikipedia as a totally reliable resource as, according to the experts, 13 percent of the articles contain mistakes (10% of the experts reported factual errors of an unspecified degree, 3% of them reported spelling errors)." [89]
A famous example of verifiable material that is potentially inaccurate is the front page of the Chicago Tribune on November 3, 1948—we have an article about this headline at "Dewey defeats Truman". In this case, we have a retraction from the newspaper which provides strong evidence that the material was inaccurate.
Wikipedia articles need references to reliable sources, and articles themselves are not reliable sources. One Wikipedia article cannot be used as a source for another Wikipedia article, in most cases (there are a very small number of exceptions, such as cases where an article on Wikipedia is about Wikipedia or Wikipedia policies). Instead ...
However, although Wikipedia articles are tertiary sources, Wikipedia employs no systematic mechanism for fact-checking or accuracy. Thus, Wikipedia articles (and Wikipedia mirrors) in themselves are not reliable sources for any purpose (except as sources on themselves per WP:SELFSOURCE). Primary sources are often difficult to use appropriately.
If a Wikipedia article links to this page, it is due to an editor's concerns regarding the accuracy of statements within that article. Statements causing such concern are marked with the tags [disputed – discuss] or [dubious – discuss]. An editor can insert such a warning by using the templates {{Disputed inline}} or {}.
Wikipedia:No original research, and a litany of essays such as Wikipedia:The Truth, give us guidance for when we personally disagree with a source based on our own subjective views. But what about when sources disagree on basic facts, and one source is just clearly right, or where a source makes a claim that defies common sense and does not ...
But when editors discuss sources (for example, to debate their appropriateness or reliability) the word source has four related meanings: The work itself (the article, book) and works like it ("An obituary can be a useful biographical source", "A recent source is better than an old one")
External peer review is a Wikipedia project namespace list of reviews of the accuracy of Wikipedia articles and other Wikipedia content posted by newspapers, magazines, and other agencies outside of Wikipedia.