MLA

Pound, Ezra, 1885-1972. Mussolini (unpub essay): typescript. Box 113, folder 4831. n.d.. https://collections.library.yale.edu/catalog/17122801.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 113, folder 4831"])(n.d.)[Mussolini (unpub essay): typescript]. https://collections.library.yale.edu/catalog/17122801.