MLA

Wilson, John C., approximately 1899-1961. Production files. Box 1, folder 7. 1931-1935. https://collections.library.yale.edu/catalog/17290459.

APA, 6th edition

Wilson, John C., approximately 1899-1961. (["Box 1, folder 7"])(1931-1935)[Production files]. https://collections.library.yale.edu/catalog/17290459.