MLA

Van Vechten, Carl, 1880-1964. Hatfield, Hurd. Box 352 | Folder 4736. 1950 June 11. https://collections.library.yale.edu/catalog/2036490.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 352 | Folder 4736"])(1950 June 11)[Hatfield, Hurd]. https://collections.library.yale.edu/catalog/2036490.