MLA

Yale University. School of Medicine, Yerkes, Ada Watterson, 1873-, Yerkes, Robert Mearns, 1876-1956. Robert M. and Ada W. Yerkes. 20th century. https://collections.library.yale.edu/catalog/16788742.

APA, 6th edition

Yale University. School of Medicine, & Yerkes, Ada Watterson, 1873-, & Yerkes, Robert Mearns, 1876-1956. (20th century)[Robert M. and Ada W. Yerkes]. https://collections.library.yale.edu/catalog/16788742.