MLA

Van Vechten, Carl, 1880-1964. Benedusi, Roberto. Box 335, folder 4217. 1935 November 23. https://collections.library.yale.edu/catalog/2030617.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 335, folder 4217"])(1935 November 23)[Benedusi, Roberto]. https://collections.library.yale.edu/catalog/2030617.