MLA

Pound, Ezra, 1885-1972. CATHAY: setting typescript. Box 80, folder 3542. n.d.. https://collections.library.yale.edu/catalog/17430562.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 80, folder 3542"])(n.d.)[CATHAY: setting typescript]. https://collections.library.yale.edu/catalog/17430562.