MLA

Pound, Ezra, 1885-1972. Typescript. Box 70, folder 3130. n.d.. https://collections.library.yale.edu/catalog/16036149.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 70, folder 3130"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/16036149.