One source quoted in another - Notes-bibliography style: citing specific types of sources - Part II. Source Citation

A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

One source quoted in another
Notes-bibliography style: citing specific types of sources
Part II. Source Citation

Responsible researchers avoid repeating quotations that they have not actually seen in the original. If one source includes a useful quotation from another source, readers expect you to obtain the original to verify not only that the quotation is accurate, but also that it fairly represents what the original meant.

If the original source is unavailable, however, cite it as “quoted in” the secondary source in your note. For the bibliography entry, adapt the “quoted in” format as needed.

N: 8. Louis Zukofsky, “Sincerity and Objectification,” Poetry 37 (February 1931): 269, quoted in Bonnie Costello, Marianne Moore: Imaginary Possessions (Cambridge, MA: Harvard University Press, 1981), 78.

B: Zukofsky, Louis. “Sincerity and Objectification.” Poetry 37 (February 1931): 269. Quoted in Bonnie Costello, Marianne Moore: Imaginary Possessions. Cambridge, MA: Harvard University Press, 1981.

The same situation may arise with a quotation you find in a secondary source drawn from a primary source (see 3.1.1). Often, you will not be able to consult the primary source, especially if it is in an unpublished manuscript collection. In this case, follow the principles outlined above.