MLA

Van Vechten, Carl, 1880-1964. Haynes, Eugene. Box 92, folder 1605. 1947 August 5. https://collections.library.yale.edu/catalog/2022925.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 92, folder 1605"])(1947 August 5)[Haynes, Eugene]. https://collections.library.yale.edu/catalog/2022925.