MLA

Van Vechten, Carl, 1880-1964. Bel Geddes, Barbara. Box 393, folder 6022. 1955 June 3. https://collections.library.yale.edu/catalog/2001967.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 393, folder 6022"])(1955 June 3)[Bel Geddes, Barbara]. https://collections.library.yale.edu/catalog/2001967.