MLA

Pound, Ezra, 1885-1972. Typescript. Box 88, folder 3802. n.d.. https://collections.library.yale.edu/catalog/17122712.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 88, folder 3802"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/17122712.