The Chicago Manual of Style (CMS) covers a variety of topics from manuscript preparation and publication to grammar, usage, and documentation and has been lovingly called the “editors’ bible.” The material in this resource focuses primarily on one of the two CMS documentation styles: the Notes-Bibliography System (NB), which is used by those in literature, history, and the arts. The other documentation style, the Author-Date System, is nearly identical in content but slightly different in form and is preferred in the social sciences.
In addition to consulting the The Chicago Manual of Style (17th ed.) for more information, students may also find it useful to consult Kate L. Turabian's Manual for Writers of Research Papers, Theses, and Dissertations (8th ed.). This manual, which presents what is commonly known as the "Turabian" citation style, follows the two CMS patterns of documentation but offers slight modifications suited to student texts.
(Source: OWL Purdue Online Writing Lab)
Citing Sources: Chicago 17th edition
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Chicago Manual of Style Guide from Purdue Online Writing Lab
A very practical and reliable guide was published by renowned Purdue University's Online Writing Lab (OWL).
Chicago Style - Quick Guide
Turabian notes and citations are essentially the same as those presented in The Chicago Manual of Style, with slight simplifications for the needs of student writers.