MLA

Van Vechten, Carl, 1880-1964. Briansky, Oleg, as Prince Danilo, in The Merry Widow, ballet choreographed by Ruth Page. Box 338, folder 4299. 1955 December 26. https://collections.library.yale.edu/catalog/2031259.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 338, folder 4299"])(1955 December 26)[Briansky, Oleg, as Prince Danilo, in The Merry Widow, ballet choreographed by Ruth Page]. https://collections.library.yale.edu/catalog/2031259.