MLA

Pound, Ezra, 1885-1972. Typescript. Box 71, folder 3174. n.d.. https://collections.library.yale.edu/catalog/16054041.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 71, folder 3174"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/16054041.