MLA

Pound, Ezra, 1885-1972. Typescript. Box 139, folder 6116. n.d.. https://collections.library.yale.edu/catalog/17122864.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 139, folder 6116"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/17122864.