MLA

Van Vechten, Carl, 1880-1964. Wilson, Ellis. Box 109 | Folder 2001. 1948 April 15. https://collections.library.yale.edu/catalog/2028777.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 109 | Folder 2001"])(1948 April 15)[Wilson, Ellis]. https://collections.library.yale.edu/catalog/2028777.