MLA

Van Vechten, Carl, 1880-1964. Cooper, Maurice, as Nanki-Poo in The Swing Mikado, musical by Gentry Warden, based on The Mikado; or, The Town of Titipu, a comic opera by Arthur Sullivan and libretto by W. S. Gilbert. Box 87, folder 1490. 1939 April 24. https://collections.library.yale.edu/catalog/2021950.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 87, folder 1490"])(1939 April 24)[Cooper, Maurice, as Nanki-Poo in The Swing Mikado, musical by Gentry Warden, based on The Mikado; or, The Town of Titipu, a comic opera by Arthur Sullivan and libretto by W. S. Gilbert]. https://collections.library.yale.edu/catalog/2021950.