MLA

Pound, Ezra, 1885-1972. Ogden, Charles Kay. Box 38, folder 1603-1604. 1935-38. https://collections.library.yale.edu/catalog/17122606.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 38, folder 1603-1604"])(1935-38)[Ogden, Charles Kay]. https://collections.library.yale.edu/catalog/17122606.