MLA

Pound, Ezra, 1885-1972. Typescript. Box 69, folder 3100. n.d.. https://collections.library.yale.edu/catalog/15471245.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 69, folder 3100"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/15471245.