MLA

Pound, Ezra, 1885-1972. Lettere e zavorra: typescript. Box 110, folder 4631. [1939]. https://collections.library.yale.edu/catalog/17122784.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 110, folder 4631"])([1939])[Lettere e zavorra: typescript]. https://collections.library.yale.edu/catalog/17122784.