MLA

Van Vechten, Carl, 1880-1964. Marshall, Armina. Box 366, folder 5116. 1934 February 13. https://collections.library.yale.edu/catalog/2056013.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 366, folder 5116"])(1934 February 13)[Marshall, Armina]. https://collections.library.yale.edu/catalog/2056013.