MLA

Van Vechten, Carl, 1880-1964. Emery, Gilbert. Box 346, folder 4549. 1932 October 4. https://collections.library.yale.edu/catalog/2034134.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 346, folder 4549"])(1932 October 4)[Emery, Gilbert]. https://collections.library.yale.edu/catalog/2034134.