MLA

Willis, John, 1957-. Camp Road Sign. Box 9 (Oversize), folder 109. 2016 October. https://collections.library.yale.edu/catalog/33255155.

APA, 6th edition

Willis, John, 1957-. (["Box 9 (Oversize), folder 109"])(2016 October)[Camp Road Sign]. https://collections.library.yale.edu/catalog/33255155.