MLA

Pound, Ezra, 1885-1972. Collector of Poems: typescript. Box 95, folder 4001. n.d.. https://collections.library.yale.edu/catalog/17122726.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 95, folder 4001"])(n.d.)[Collector of Poems: typescript]. https://collections.library.yale.edu/catalog/17122726.