MLA

Pound, Ezra, 1885-1972. Typescript. Box 78, folder 3469. n.d.. https://collections.library.yale.edu/catalog/11705472.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 78, folder 3469"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/11705472.