MLA

Van Vechten, Carl, 1880-1964. Wilson, Ellis. Box 109, folder 2002. 1959 August 12. https://collections.library.yale.edu/catalog/2028785.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 109, folder 2002"])(1959 August 12)[Wilson, Ellis]. https://collections.library.yale.edu/catalog/2028785.