MLA

Van Vechten, Carl, 1880-1964. Anderson, Sherwood. Box 332, folder 4125. 1933 November 29. https://collections.library.yale.edu/catalog/2029563.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 332, folder 4125"])(1933 November 29)[Anderson, Sherwood]. https://collections.library.yale.edu/catalog/2029563.