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this is a guideline discussing the reliability of particular types of sources. the relevant policies on sources are wikipedia:verifiability and wikipedia:no original research, and additional restrictions in biographies of living people. wikipedia articles should cover all major and significant-minority views that have been published by reliable sources. see wikipedia:neutral point of view.
wikipedia articles should use reliable, third-party, published sources. reliable sources are credible published materials with a reliable publication process; their authors are generally regarded as trustworthy or authoritative in relation to the subject at hand. how reliable a source is depends on context. as a rule of thumb, the more people engaged in checking facts, analyzing legal issues, and scrutinizing the writing, the more reliable the publication. sources should directly support the information as it is presented in an article and should be appropriate to the claims made; if an article topic has no reliable sources, wikipedia should not have an article on it. see wikipedia:reliable sources/noticeboard for queries about the reliability of particular sources.