MLA

Pound, Ezra, 1885-1972. Typescripts. Box 73, folder 3277. n.d.. https://collections.library.yale.edu/catalog/17122670.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 73, folder 3277"])(n.d.)[Typescripts]. https://collections.library.yale.edu/catalog/17122670.