The Chicago manual of style Online

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The Chicago Manual of Style is a style guide for American English published since 1906 by the University of Chicago Press. The notes and bibliography style is preferred in the fields of humanities, including those in literature, history, and the arts. This style presents bibliographic information in notes and, often, a bibliography.

The Chicago Manual of Style presents two basic documentation systems: (1) notes and bibliography and (2) author-date. Choosing between the two often depends on subject matter and the nature of sources cited, as each system is favored by different groups of scholars.