MLA

Van Vechten, Carl, 1880-1964. Gillmore, Margalo. Box 350, folder 4655. 1933 March 23. https://collections.library.yale.edu/catalog/2035355.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 350, folder 4655"])(1933 March 23)[Gillmore, Margalo]. https://collections.library.yale.edu/catalog/2035355.