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These examples show several common methods that Wikipedia editors use to make their articles verifiable. Wikipedia editors are free to use any of these methods, or to develop newer methods—no particular method is preferred. However some method is required and each article must use the same method throughout the entire article. (When making changes to an article that already has sources, an editor should study the method already in use.)
This article is only intended to provide examples and give a rough introduction to the methods in use. This article does not debate their respective merits or consider any precise technical details. For this information, please see other guides such as: Citing sources, Citation templates, Footnotes and Harvard references.