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An example of common knowledge would be: Some chickens lay brown eggs.
By contrast, an example of a fact that is not common knowledge would be: Some chickens lay blue and green eggs.
If you already know which system to use, follow one of the links above to see sample citations for a variety of common sources. The notes and bibliography style is popular in the humanities—including literature, history, and the arts.
In this system, sources are cited in numbered footnotes or endnotes.