MLA

Willis, John, 1957-. Untitled. Box 9 (Oversize), folder 121. 2016 September-December. https://collections.library.yale.edu/catalog/33255191.

APA, 6th edition

Willis, John, 1957-. (["Box 9 (Oversize), folder 121"])(2016 September-December)[Untitled]. https://collections.library.yale.edu/catalog/33255191.