MLA

Van Vechten, Carl, 1880-1964. Marshall, William, as God in The Green Pastures, play by Marc Connelly adapted from Ol' Man Adam an' His Chillun by Roark Bradford. Box 224. 1951 April 12. https://collections.library.yale.edu/catalog/2023382.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 224"])(1951 April 12)[Marshall, William, 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/2023382.