MLA

Pound, Ezra, 1885-1972. Typescripts. Box 76, folder 3385. n.d.. https://collections.library.yale.edu/catalog/17122690.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 76, folder 3385"])(n.d.)[Typescripts]. https://collections.library.yale.edu/catalog/17122690.