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Chicago is a documentation style that has been published by the Chicago University Press since 1906.The Notes style is preferred by many arts and humanities disciplines, especially history, as well as some political science publications. Citations are provided in footnotes or endnotes and are usually accompanied by a bibliography.
"Turabian" style, widely used for decades by students, is essentially a simplified version of the Chicago Style.
For information about the Chicago Author-Date style recommended for some physical, natural, and social sciences, please see to the Author-Date style page.