MLA

Pound, Ezra, 1885-1972. Cantos: 32-34 "J. Q. A.": autograph notes. Box 72, folder 3250. n.d.. https://collections.library.yale.edu/catalog/16169386.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 72, folder 3250"])(n.d.)[Cantos: 32-34 "J. Q. A.": autograph notes]. https://collections.library.yale.edu/catalog/16169386.