MLA

Van Vechten, Carl, 1880-1964. Mittelholzer, Edgar. Box 224. 1952 November 13. https://collections.library.yale.edu/catalog/2023613.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 224"])(1952 November 13)[Mittelholzer, Edgar]. https://collections.library.yale.edu/catalog/2023613.