MLA

Van Vechten, Carl, 1880-1964. Cornell, Katharine. Box 342 | Folder 4417. 1933 January 10. https://collections.library.yale.edu/catalog/2032210.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 342 | Folder 4417"])(1933 January 10)[Cornell, Katharine]. https://collections.library.yale.edu/catalog/2032210.