MLA

Van Vechten, Carl, 1880-1964. Huppler, Dudley. Box 354 | Folder 4784. 1950 February 21. https://collections.library.yale.edu/catalog/2054265.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 354 | Folder 4784"])(1950 February 21)[Huppler, Dudley]. https://collections.library.yale.edu/catalog/2054265.