MLA

Van Vechten, Carl, 1880-1964. Waters, Ethel. Box 107 | Folder 1957. 1933 June 22. https://collections.library.yale.edu/catalog/2028303.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 107 | Folder 1957"])(1933 June 22)[Waters, Ethel]. https://collections.library.yale.edu/catalog/2028303.