MLA

Pound, Ezra, 1885-1972. Jefferson E Mussolini: typescript. Box 109, folder 4584. n.d.. https://collections.library.yale.edu/catalog/2042161.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 109, folder 4584"])(n.d.)[Jefferson E Mussolini: typescript]. https://collections.library.yale.edu/catalog/2042161.