MLA

Pound, Ezra, 1885-1972. Typescript. Box 72, folder 3242. n.d.. https://collections.library.yale.edu/catalog/16169379.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 72, folder 3242"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/16169379.