MLA

Pound, Ezra, 1885-1972. Typescript. Box 74, folder 3340. n.d.. https://collections.library.yale.edu/catalog/17122685.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 74, folder 3340"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/17122685.