MLA

Pound, Ezra, 1885-1972. Macleod, Joseph Gordon. Box 32, folder 1332. 1929-38. https://collections.library.yale.edu/catalog/17122591.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 32, folder 1332"])(1929-38)[Macleod, Joseph Gordon]. https://collections.library.yale.edu/catalog/17122591.