MLA

Van Vechten, Carl, 1880-1964. Hughes, Langston. Box 223. 1940. https://collections.library.yale.edu/catalog/2018581.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 223"])(1940)[Hughes, Langston]. https://collections.library.yale.edu/catalog/2018581.