MLA

Van Vechten, Carl, 1880-1964. Murphy, Esther. Box 369, folder 5203. 1934 February 16. https://collections.library.yale.edu/catalog/2030164.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 369, folder 5203"])(1934 February 16)[Murphy, Esther]. https://collections.library.yale.edu/catalog/2030164.