MLA

Pound, Ezra, 1885-1972. Peggram, Edwin. Box 40, folder 1686. 1942. https://collections.library.yale.edu/catalog/17409020.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 40, folder 1686"])(1942)[Peggram, Edwin]. https://collections.library.yale.edu/catalog/17409020.