MLA

Van Vechten, Carl, 1880-1964. Bromfield, Louis. Box 664, folder 14637. 1933 November 2. https://collections.library.yale.edu/catalog/33270842.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 664, folder 14637"])(1933 November 2)[Bromfield, Louis]. https://collections.library.yale.edu/catalog/33270842.