MLA

Richards, Lloyd, 1919-2006. New York production. Box 42, folder 424-425. 1958-1960. https://collections.library.yale.edu/catalog/10106328.

APA, 6th edition

Richards, Lloyd, 1919-2006. (["Box 42, folder 424-425"])(1958-1960)[New York production]. https://collections.library.yale.edu/catalog/10106328.