MLA

Van Vechten, Carl, 1880-1964. Calder, Alexander. Box 339 | Folder 4329. 1947 July 10. https://collections.library.yale.edu/catalog/2031461.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 339 | Folder 4329"])(1947 July 10)[Calder, Alexander]. https://collections.library.yale.edu/catalog/2031461.