MLA

Van Vechten, Carl, 1880-1964. Klopfer, Donald. Box 356 | Folder 4853. 1934 February 23. https://collections.library.yale.edu/catalog/2054907.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 356 | Folder 4853"])(1934 February 23)[Klopfer, Donald]. https://collections.library.yale.edu/catalog/2054907.