MLA

Van Vechten, Carl, 1880-1964. Zoritch, George. Box 384, folder 5754. 1940 April 11. https://collections.library.yale.edu/catalog/10674796.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 384, folder 5754"])(1940 April 11)[Zoritch, George]. https://collections.library.yale.edu/catalog/10674796.