MLA

Van Vechten, Carl, 1880-1964. Davis, Ossie, as Gabriel, and William Marshall as God in The Green Pastures, play by Marc Connelly adapted from Ol' Man Adam an' His Chillun by Roark Bradford. Box 88, folder 1520. 1951 April 12. https://collections.library.yale.edu/catalog/2026357.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 88, folder 1520"])(1951 April 12)[Davis, Ossie, as Gabriel, and William Marshall as God in The Green Pastures, play by Marc Connelly adapted from Ol' Man Adam an' His Chillun by Roark Bradford]. https://collections.library.yale.edu/catalog/2026357.