MLA

Van Vechten, Carl, 1880-1964. Headley, Godfrey. Box 226. 1959 December 15. https://collections.library.yale.edu/catalog/2024808.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 226"])(1959 December 15)[Headley, Godfrey]. https://collections.library.yale.edu/catalog/2024808.