MLA

Van Vechten, Carl, 1880-1964. Servoss, Mary. Box 375 | Folder 5398. 1934 November 22. https://collections.library.yale.edu/catalog/10052338.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 375 | Folder 5398"])(1934 November 22)[Servoss, Mary]. https://collections.library.yale.edu/catalog/10052338.