First reference: Secondary source

19. Louis Zukofsky, "Sincerity and Objectification," Poetry 37 (February 1931): 269, quoted in Bonnie Costello, Marianne Moore: Imaginary Possessions (Cambridge and London: Harvard University Press, 1981), 78.

[The student-writer found the Zukofsky quotation in Costello's book, not in Zukofsky's original article.]