MLA

Van Vechten, Carl, 1880-1964. Winninger, Charles, as Cap'n Andy Hawks during a performance of Showboat, musical with music by Jerome Kern and lyrics by Oscar Hammerstein II, at the Casino Theatre. Box 385, folder 5760. 1932 August 1. https://collections.library.yale.edu/catalog/10640284.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 385, folder 5760"])(1932 August 1)[Winninger, Charles, as Cap'n Andy Hawks during a performance of Showboat, musical with music by Jerome Kern and lyrics by Oscar Hammerstein II, at the Casino Theatre]. https://collections.library.yale.edu/catalog/10640284.