MLA

Pound, Ezra, 1885-1972. Franklin, Albert Barnes. Box 17, folder 765. 1936. https://collections.library.yale.edu/catalog/11538561.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 17, folder 765"])(1936)[Franklin, Albert Barnes]. https://collections.library.yale.edu/catalog/11538561.