MLA

Van Vechten, Carl, 1880-1964. Maynor, Dorothy. Box 97, folder 1741. 1939 September 23. https://collections.library.yale.edu/catalog/2026377.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 97, folder 1741"])(1939 September 23)[Maynor, Dorothy]. https://collections.library.yale.edu/catalog/2026377.