MLA

Van Vechten, Carl, 1880-1964. Dolin, Anton, as Baron Bluebeard, in Bluebeard, choreographed by Michel Fokine. Box 344, folder 4472. 1944 May 11. https://collections.library.yale.edu/catalog/2033072.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 344, folder 4472"])(1944 May 11)[Dolin, Anton, as Baron Bluebeard, in Bluebeard, choreographed by Michel Fokine]. https://collections.library.yale.edu/catalog/2033072.