MLA

Pound, Ezra, 1885-1972. Typescript. Box 74, folder 3319. n.d.. https://collections.library.yale.edu/catalog/10257453.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 74, folder 3319"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/10257453.