MLA

Pound, Ezra, 1885-1972. Stresino, Edward. Box 50, folder 2243. [1954-56]. https://collections.library.yale.edu/catalog/17122635.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 50, folder 2243"])([1954-56])[Stresino, Edward]. https://collections.library.yale.edu/catalog/17122635.