MLA

Van Vechten, Carl, 1880-1964. Pavlović Barilli, Milena. Box 370, folder 5259. 1940 November 9. https://collections.library.yale.edu/catalog/2067047.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 370, folder 5259"])(1940 November 9)[Pavlović Barilli, Milena]. https://collections.library.yale.edu/catalog/2067047.