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One of the problems that Wikipedia is most criticized for is that it is not always reliable. This is true, since anybody can change most articles and add anything they like. Sometimes bad changes stay in place for a long time. Wikipedia guidelines such as
These guidelines are there for two reasons:
However, many sources are not suitable for use in Wikipedia because they are not reliable.
This is a guideline about the types of sources which are reliable. Wikipedia articles should use reliable, third-party, published sources. (An article is a page in the main
Sources used in Wikipedia should have been published. Some published documents are written by just one person, and nobody else checks it before it is published. It is easy for these sources to contain mistakes or untrue information. Other documents are written by people who have studied the subject for many years, and many other people have read them carefully to make sure that the information is correct. Although both kinds of documents can contain things that are not true, documents that people have checked are more likely to contain correct information and to reflect the most common views on a subject. These are called reliable sources.
How reliable a source is depends on context. Some publishers like the