MLA

Pound, Ezra, 1885-1972. Notes, autograph and typescript. Box 70, folder 3139. [1922?]. https://collections.library.yale.edu/catalog/16036191.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 70, folder 3139"])([1922?])[Notes, autograph and typescript]. https://collections.library.yale.edu/catalog/16036191.