MLA

Van Vechten, Carl, 1880-1964. Anderson, Marian. Box 223. 1940 January 14. https://collections.library.yale.edu/catalog/2018443.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 223"])(1940 January 14)[Anderson, Marian]. https://collections.library.yale.edu/catalog/2018443.