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Copies of Wikipedia are not reliable sources and not acceptable external links in articles per the verifiability policy. Articles that use a republished work as a source should be edited to either remove the work or to tag the source with {{Circular-ref}}. Leave {{backwardscopy}} on the article's talk page to identify Wikipedia as the original ...
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.
The guideline Wikipedia:Identifying reliable sources gives general advice on what is and isn't a reliable source; this essay aims to analyse specific examples of sources that might initially appear to be reliable, yet may not be. If in doubt about a source, discuss this at the reliable sources noticeboard.
Wikipedia pages often cite reliable secondary sources that vet data from primary sources. If the information on another Wikipedia page (which you want to cite as the source) has a primary or secondary source, you ought be able to cite that primary or secondary source and eliminate the middleman (or "middle-page" in this case).
For a source to be added to this list, editors generally expect two or more significant discussions about the source's reliability in the past, or an uninterrupted request for comment on the source's reliability that took place on the reliable sources noticeboard. For a discussion to be considered significant, most editors expect no fewer than ...
We are not compilers of personal knowledge, we are compilers of published information. If there is no published information that discusses a topic, then Wikipedia is not the place to discuss that topic. If an article does not have reliable sources, the information in the article is non-verifiable. Because verifiability is a non-negotiable ...
A known example is the Sacha Baron Cohen article, where false information added in Wikipedia was apparently used by two newspapers, leading to it being treated as reliable in Wikipedia. [124] [better source needed] This process of creating reliable sources for false facts has been termed "citogenesis" by xkcd webcomic artist Randall Munroe.
Wikipedia does have a responsibility, under the due-weight policy and our goal of presenting complete information, to not completely ignore a minority viewpoint, as long as it is treated substantially as a subject itself in multiple independent reliable sources.