MLA

Van Vechten, Carl, 1880-1964. Benton, Rita Piacenza. Box 335, folder 4228. 1935 April 16. https://collections.library.yale.edu/catalog/2030745.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 335, folder 4228"])(1935 April 16)[Benton, Rita Piacenza]. https://collections.library.yale.edu/catalog/2030745.