MLA

Pound, Ezra, 1885-1972. American Imperialist: "Gammon": typescript. Box 126, folder 5227. [1943] Feb 8. https://collections.library.yale.edu/catalog/17122837.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 126, folder 5227"])([1943] Feb 8)[American Imperialist: "Gammon": typescript]. https://collections.library.yale.edu/catalog/17122837.