MLA

Van Vechten, Carl, 1880-1964. Woollcott, Alexander. Box 384, folder 5736. 1939 January 3. https://collections.library.yale.edu/catalog/10647760.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 384, folder 5736"])(1939 January 3)[Woollcott, Alexander]. https://collections.library.yale.edu/catalog/10647760.