MLA

Van Vechten, Carl, 1880-1964. Dowell, Coleman. Box 345 | Folder 4508. 1957 February 26. https://collections.library.yale.edu/catalog/2033452.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 345 | Folder 4508"])(1957 February 26)[Dowell, Coleman]. https://collections.library.yale.edu/catalog/2033452.