MLA

Pound, Ezra, 1885-1972. Di Marzio, Cornelio. Box 13, folder 587-588. 1939-43. https://collections.library.yale.edu/catalog/31964650.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 13, folder 587-588"])(1939-43)[Di Marzio, Cornelio]. https://collections.library.yale.edu/catalog/31964650.