Chicago Manual of Style (CMOS)

Chicago-style source citations come in two varieties: (1) notes and bibliography and (2) author-date. 
This guide will follow the author-date system.

"The author-date system is more common in the sciences and social sciences. In this system, sources are briefly cited in the text, usually in parentheses, by author’s last name and year of publication. Each in-text citation matches up with an entry in a reference list, where full bibliographic information is provided." CMOS 

The notes and bibliography system is preferred in the humanities, literature, history, and the arts. 

Learn more about the Chicago Manual of Style from the Chicago Manual of Style Online website and the Chicago Manual of Style 17th Edition - Purdue Online Writing Lab.

Here are sites that would help you with the Chicago Style. 

The Official Chicago Guide - Chicago Manual of Style Online website good for all questions about Chicago Style.
Chicago Manual of Style 17th Edition - Purdue Online Writing Lab (OWL)

CMOS Author Date Sample Paper - Purdue Online Writing Lab (OWL)

CMOS Author Date PowerPoint Presentation - Purdue Online Writing Lab (OWL)

CMOS Author Date Classroom Poster - Purdue Online Writing Lab (OWL)

Click the Paper Formatting tab for tip sheets on how to format the paper, the reference list and in-text citations from the Chicago Manual of Style website.