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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.
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 ...
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).
The Wikipedia online encyclopedia has, since the late 2000s, served as a popular source for health information for both laypersons and, in many cases, health care practitioners. Health-related articles on Wikipedia are popularly accessed as results from search engines, which frequently deliver links to Wikipedia articles. [1]
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.
Due to the specialised skills required to assess financial health this material should not be used in isolation, a more acceptable judgement of the organisation can be obtained from investment analysis conducted in some segments of the business press, stock markets and significant investment vehicles.
A type of source that is good for scientific information is not usually as reliable for political information, and vice versa. Since Wikipedia's readers may make medical decisions based on information found in our articles, [1] we want to use high-quality sources when