MLA

Van Vechten, Carl, 1880-1964. Mitchell, James. Box 367, folder 5166. 1952 February 5. https://collections.library.yale.edu/catalog/2067090.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 367, folder 5166"])(1952 February 5)[Mitchell, James]. https://collections.library.yale.edu/catalog/2067090.