MLA

Van Vechten, Carl, 1880-1964. Harlem. Dunbar Apartments. Box 225. 1940 September 4. https://collections.library.yale.edu/catalog/2024490.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 225"])(1940 September 4)[Harlem. Dunbar Apartments]. https://collections.library.yale.edu/catalog/2024490.