MLA

Van Vechten, Carl, 1880-1964. Dreiser, Theodore. Box 345 | Folder 4522. 1933 November 8. https://collections.library.yale.edu/catalog/2033520.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 345 | Folder 4522"])(1933 November 8)[Dreiser, Theodore]. https://collections.library.yale.edu/catalog/2033520.