MLA

Van Vechten, Carl, 1880-1964. Kent, Rockwell. Box 356 | Folder 4846. 1933 April 18. https://collections.library.yale.edu/catalog/2054785.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 356 | Folder 4846"])(1933 April 18)[Kent, Rockwell]. https://collections.library.yale.edu/catalog/2054785.