MLA

Van Vechten, Carl, 1880-1964. Motley, Willard. Box 100, folder 1781. 1947 June 13. https://collections.library.yale.edu/catalog/2026983.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 100, folder 1781"])(1947 June 13)[Motley, Willard]. https://collections.library.yale.edu/catalog/2026983.