Chicago style consists of two systems of citation: a notes-bibliography system, and an author-date system. The notes-bibliography system is used in the humanities, particularly history, while the author-date system is frequently used in the social sciences. Both systems are covered in the Chicago Manual of Style.
Chicago Manual of Style. (2017). (17th ed.) Chicago: University of Chicago Press. The call number is Z 253 U69. A copy is available in the University Library reference collection.