MLA

Van Vechten, Carl, 1880-1964. Douglas, Mahala Dutton. Box 345, folder 4498. 1935 November 22. https://collections.library.yale.edu/catalog/2033345.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 345, folder 4498"])(1935 November 22)[Douglas, Mahala Dutton]. https://collections.library.yale.edu/catalog/2033345.