MLA

Van Vechten, Carl, 1880-1964. Marchant, Claude. Box 223. 1947 February 21. https://collections.library.yale.edu/catalog/2022348.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 223"])(1947 February 21)[Marchant, Claude]. https://collections.library.yale.edu/catalog/2022348.