Chicago style is often used within the field of history, although it is used by other humanities-based disciplines as well. The first edition of the Manual was published in 1906 by the Unversity of Chicago Press.
Chicago style offers two options for in text documentation:
1. Superscript numbers within a paper to designate paraphrased, summarized, or quoted material, which correspond to footnotes or endnotes that specify the author, title, and page(s) cited.
2. (Author Date) parenthetical citations within a paper to indicate paraphrased, summarized or quoted material.
In both cases, the Bibliography at the end of the paper includes full citations for all sources referenced in a paper. In addition, it may include sources the writer consulted but did not paraphrase, summarize or quote.