MLA

Van Vechten, Carl, 1880-1964. Steloff, Frances. Box 376 | Folder 5467. 1964 March 3. https://collections.library.yale.edu/catalog/10059110.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 376 | Folder 5467"])(1964 March 3)[Steloff, Frances]. https://collections.library.yale.edu/catalog/10059110.