MLA

Pound, Ezra, 1885-1972. Typescript. Box 73, folder 3259. n.d.. https://collections.library.yale.edu/catalog/17122663.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 73, folder 3259"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/17122663.