MLA

Van Vechten, Carl, 1880-1964. Pavlović Barilli, Milena. Box 370, folder 5258. 1940 May 10. https://collections.library.yale.edu/catalog/2067040.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 370, folder 5258"])(1940 May 10)[Pavlović Barilli, Milena]. https://collections.library.yale.edu/catalog/2067040.