MLA

Davis, Charles T. (Charles Twitchell), 1918-1981. Endfield, Cy. Box 5. [circa 1930s-1980]. https://collections.library.yale.edu/catalog/16769554.

APA, 6th edition

Davis, Charles T. (Charles Twitchell), 1918-1981. (["Box 5"])([circa 1930s-1980])[Endfield, Cy]. https://collections.library.yale.edu/catalog/16769554.