MLA

Van Vechten, Carl, 1880-1964. West, Dorothy. Box 108, folder 1979. 1948 May 17. https://collections.library.yale.edu/catalog/2019422.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 108, folder 1979"])(1948 May 17)[West, Dorothy]. https://collections.library.yale.edu/catalog/2019422.