MLA

Van Vechten, Carl, 1880-1964. Morris, McKay, as The Emperor Altoum, and Anna May Wong, as Princess Turandot, in Turandot, an opera by Giacomo Puccini and Franco Alfano at the Westport Country Playhouse, Westport, Connecticut. Box 368, folder 5188. 1937 August 11. https://collections.library.yale.edu/catalog/10645209.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 368, folder 5188"])(1937 August 11)[Morris, McKay, as The Emperor Altoum, and Anna May Wong, as Princess Turandot, in Turandot, an opera by Giacomo Puccini and Franco Alfano at the Westport Country Playhouse, Westport, Connecticut]. https://collections.library.yale.edu/catalog/10645209.