MLA

Van Vechten, Carl, 1880-1964. Allen, Betty. Box 82 | Folder 1343. 1958 March 27. https://collections.library.yale.edu/catalog/2020161.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 82 | Folder 1343"])(1958 March 27)[Allen, Betty]. https://collections.library.yale.edu/catalog/2020161.