MLA

Van Vechten, Carl, 1880-1964. Fraser, Phyllis. Box 348 | Folder 4621. 1940 September 11. https://collections.library.yale.edu/catalog/2034765.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 348 | Folder 4621"])(1940 September 11)[Fraser, Phyllis]. https://collections.library.yale.edu/catalog/2034765.