MLA

Pound, Ezra, 1885-1972. Typescripts. Box 279. n.d.. https://collections.library.yale.edu/catalog/16055752.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 279"])(n.d.)[Typescripts]. https://collections.library.yale.edu/catalog/16055752.