MLA

Van Vechten, Carl, 1880-1964. Marchant, Claude, as Plácido in Plácido, ballet choreographed by Claude Marchant. Box 97, folder 1731. 1947 February 21. https://collections.library.yale.edu/catalog/2026324.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 97, folder 1731"])(1947 February 21)[Marchant, Claude, as Plácido in Plácido, ballet choreographed by Claude Marchant]. https://collections.library.yale.edu/catalog/2026324.