MLA

Pound, Ezra, 1885-1972. The Curse: typescript. Box 95, folder 4010. n.d.. https://collections.library.yale.edu/catalog/17122728.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 95, folder 4010"])(n.d.)[The Curse: typescript]. https://collections.library.yale.edu/catalog/17122728.