MLA

Yerkes, Robert M. (Robert Mearns), 1876-1956. Congo. Box 131, folder 2238. 1925-1928. https://collections.library.yale.edu/catalog/10186989.

APA, 6th edition

Yerkes, Robert M. (Robert Mearns), 1876-1956. (["Box 131, folder 2238"])(1925-1928)[Congo]. https://collections.library.yale.edu/catalog/10186989.