MLA

Pound, Ezra, 1885-1972. Notes: typescript. Box 111, folder 4707. n.d.. https://collections.library.yale.edu/catalog/17122794.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 111, folder 4707"])(n.d.)[Notes: typescript]. https://collections.library.yale.edu/catalog/17122794.