Chicago Style Guide - 17th Edition

The Chicago Manual of Style recommends against citing secondary sources. A secondary source (also known as an indirect source) is a source quoted within another source. In rare cases, it is not possible to cite the original source. For example, if the source is out of print and not accessible, or is written in a language other than one you are able to read, you may need to cite a secondary source. 

• Use secondary sources sparingly; you should always try to locate the original source of information which is cited in a work that you have read. 
• It is always better to cite information from the original source when possible. If the original source is not available, both the original and the secondary source must be listed.

FORMAT

Author's LastName, FirstName. "Title of Original Work Quoted Material is from." Title of Original Journal Quoted Material is from. volume, no. issue (Year): xx. Quoted in FirstAuthor's FirstName LastName and SecondAuthor's FirstName LastName. Title of Work Containing Quoted Material. PlacePublished: Publisher, Year, xx.

EXAMPLE

Rogers, John. “Theoretical Issues in the Study of Crime.” Criminology Review 30, no. 2 (2006): 21. Quoted in Sara Townsend and Helen White. Youth Justice. New York: Random House, 2008, 56.

FOOTNOTE FORM

43. John Rogers, “Theoretical Issues in the Study of Crime,” Criminology Review 30, no. 2 (2006): 21, quoted in Sara Townsend and Helen White, Youth Justice (New York: Random House, 2008), 56.