MLA

Pound, Ezra, 1885-1972. The Cultural Failure of America: typescript. Box 95, folder 3998. n.d.. https://collections.library.yale.edu/catalog/17122723.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 95, folder 3998"])(n.d.)[The Cultural Failure of America: typescript]. https://collections.library.yale.edu/catalog/17122723.