MLA

Van Vechten, Carl, 1880-1964. Kusaila, Joseph. Box 357, folder 4890. 1946 January 19. https://collections.library.yale.edu/catalog/2055343.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 357, folder 4890"])(1946 January 19)[Kusaila, Joseph]. https://collections.library.yale.edu/catalog/2055343.