Let's say you read an article by Niditch, who cites a book by Speiser. You want to cite Speiser's words, but have not read Speiser's book itself.
Footnote:
7 E. A. Speiser, Genesis (AB; Garden City: Doubleday, 1964), p. 300, quoted in Susan Niditch, "The Wronged Woman Righted: An Analysis of Genesis 38," The Harvard Theological Review 72/2 (Jan.-Apr. 1979): 143.
Bibliographic entry:
Speiser, E. A. Genesis. Anchor Bible series. Garden City: Doubleday, 1964. Quoted in Susan Niditch, "The Wronged Woman Righted: An Analysis of Genesis 38," The Harvard Theological Review 72/2 (Jan.-Apr. 1979): 143-149.