MLA

Van Vechten, Carl, 1880-1964. Cross, James "Stump", in This Is the Army, musical with music by Irving Berlin and book by Irving Berlin and James McColl. Box 88, folder 1495. 1942 August 11. https://collections.library.yale.edu/catalog/2021994.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 88, folder 1495"])(1942 August 11)[Cross, James "Stump", in This Is the Army, musical with music by Irving Berlin and book by Irving Berlin and James McColl]. https://collections.library.yale.edu/catalog/2021994.