MLA

Yerkes, Robert M. (Robert Mearns), 1876-1956. Test forms. Box 93, folder 1769-1771. 1918. https://collections.library.yale.edu/catalog/10011428.

APA, 6th edition

Yerkes, Robert M. (Robert Mearns), 1876-1956. (["Box 93, folder 1769-1771"])(1918)[Test forms]. https://collections.library.yale.edu/catalog/10011428.