MLA

Yerkes, Robert M. (Robert Mearns), 1876-1956. The Great Apes illustrations. Box 133, folder 2242-2258. Circa 1929. https://collections.library.yale.edu/catalog/10186857.

APA, 6th edition

Yerkes, Robert M. (Robert Mearns), 1876-1956. (["Box 133, folder 2242-2258"])(Circa 1929)[The Great Apes illustrations]. https://collections.library.yale.edu/catalog/10186857.