MLA

Van Vechten, Carl, 1880-1964. Gibson, Ian Wallace, as Alain in La fille mal gardée, choreographed by Bronislava Nijinska after Jean Dauberval. Box 349, folder 4647. 1941 December 9. https://collections.library.yale.edu/catalog/2035125.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 349, folder 4647"])(1941 December 9)[Gibson, Ian Wallace, as Alain in La fille mal gardée, choreographed by Bronislava Nijinska after Jean Dauberval]. https://collections.library.yale.edu/catalog/2035125.