MLA

Van Vechten, Carl, 1880-1964. White, Walter. Box 109 | Folder 1988. 1938 July 12. https://collections.library.yale.edu/catalog/2005550.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 109 | Folder 1988"])(1938 July 12)[White, Walter]. https://collections.library.yale.edu/catalog/2005550.