Skip to Main Content

Chicago Citation Style, 17th Edition: Indirect Source

A University of Lethbridge Library guide to Chicago Manual of Style citations.

Indirect Source (14.260)

Because researchers are generally expected to have consulted the sources they cite, it is advised that you not cite a source quoted within another (secondary) source. You should rather consult the original source directly. If, however, you are unable to access the original source, The Chicago Manual of Style recommends the following citation format:


N:        1. Jean Riolan, Opuscula Anatomica Nova (London: M. Flesher, 1649), 44, quoted in Lucian Petrescu, "Descartes on the Heartbeat: The Leuven Affair," Perspectives on Science 21, no. 4 (Winter 2013): 399.

B:   Riolan, Jean. Opuscula Anatomica Nova. London: M. Flesher, 1649. Quoted in Lucian Petrescu, "Descartes
             on the Heartbeat: The Leuven Affair." Perspectives on Science 21, no. 4 (Winter 2013): 397-428.


NOTE: Because the example above cites a book that was quoted in an article, the first part of the citation resembles that of a book while the second (following "quoted in") resembles that of an article. The format of these parts should change according to the kind of sources being cited.