MLA

Pound, Ezra, 1885-1972. [Frobenius]: typescript. Box 104, folder 4336. n.d.. https://collections.library.yale.edu/catalog/32161244.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 104, folder 4336"])(n.d.)[[Frobenius]: typescript]. https://collections.library.yale.edu/catalog/32161244.