MLA

Pound, Ezra, 1885-1972. Martinelli, Sheri. Box 33, folder 1389-1393. 1953-60. https://collections.library.yale.edu/catalog/17122593.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 33, folder 1389-1393"])(1953-60)[Martinelli, Sheri]. https://collections.library.yale.edu/catalog/17122593.