MLA

Van Vechten, Carl, 1880-1964. Saddler, Donald, as Franz in Coppélia, choreographed by Enrique Martinez. Box 373, folder 5361. 1942 October 30. https://collections.library.yale.edu/catalog/10034007.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 373, folder 5361"])(1942 October 30)[Saddler, Donald, as Franz in Coppélia, choreographed by Enrique Martinez]. https://collections.library.yale.edu/catalog/10034007.