MLA

Van Vechten, Carl, 1880-1964. Sullivan, Noël. Box 377 | Folder 5482. 1941 February 28. https://collections.library.yale.edu/catalog/10079595.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 377 | Folder 5482"])(1941 February 28)[Sullivan, Noël]. https://collections.library.yale.edu/catalog/10079595.