MLA

Van Vechten, Carl, 1880-1964. Kane, Whitford, as the Gravedigger in Hamlet, play by William Shakespeare. Box 355, folder 4816. 1938 October 20. https://collections.library.yale.edu/catalog/2054440.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 355, folder 4816"])(1938 October 20)[Kane, Whitford, as the Gravedigger in Hamlet, play by William Shakespeare]. https://collections.library.yale.edu/catalog/2054440.