MLA

Yerkes, Robert M. (Robert Mearns), 1876-1956. Yerkes Laboratories of Primate Biology apes. Box 134, folder 2267. 1940. https://collections.library.yale.edu/catalog/10021468.

APA, 6th edition

Yerkes, Robert M. (Robert Mearns), 1876-1956. (["Box 134, folder 2267"])(1940)[Yerkes Laboratories of Primate Biology apes]. https://collections.library.yale.edu/catalog/10021468.