MLA

Pound, Ezra, 1885-1972. Typescript. Box 71, folder 3155. 1922 Dec. https://collections.library.yale.edu/catalog/16053822.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 71, folder 3155"])(1922 Dec)[Typescript]. https://collections.library.yale.edu/catalog/16053822.