MLA

Pound, Ezra, 1885-1972. The Coward Surrealists: typescript. Box 95, folder 3974. n.d.. https://collections.library.yale.edu/catalog/17122720.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 95, folder 3974"])(n.d.)[The Coward Surrealists: typescript]. https://collections.library.yale.edu/catalog/17122720.