MLA

Pound, Ezra, 1885-1972. Typescript. Box 73, folder 3301. n.d.. https://collections.library.yale.edu/catalog/10257450.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 73, folder 3301"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/10257450.