MLA

Van Vechten, Carl, 1880-1964. Dover, Cedric. Box 89 | Folder 1546. 1948 February 25. https://collections.library.yale.edu/catalog/2022475.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 89 | Folder 1546"])(1948 February 25)[Dover, Cedric]. https://collections.library.yale.edu/catalog/2022475.