MLA

Van Vechten, Carl, 1880-1964. Rivera, Diego. Box 372, folder 5327. 1932 March 19. https://collections.library.yale.edu/catalog/10001517.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 372, folder 5327"])(1932 March 19)[Rivera, Diego]. https://collections.library.yale.edu/catalog/10001517.