MLA

Pound, Ezra, 1885-1972. Cantos LXXIV - LXXXIV: typescript drafts. Box 29, folder 627. n.d.. https://collections.library.yale.edu/catalog/2042130.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 29, folder 627"])(n.d.)[Cantos LXXIV - LXXXIV: typescript drafts]. https://collections.library.yale.edu/catalog/2042130.