MLA

Van Vechten, Carl, 1880-1964. Antheil, George. Box 333 | Folder 4152. 1934 February 13. https://collections.library.yale.edu/catalog/2030080.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 333 | Folder 4152"])(1934 February 13)[Antheil, George]. https://collections.library.yale.edu/catalog/2030080.