MLA

Pound, Ezra, 1885-1972. Typescript. Box 79, folder 3481. n.d.. https://collections.library.yale.edu/catalog/17409022.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 79, folder 3481"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/17409022.