MLA

Tinker, Chauncey Brewster, 1876-1963. Todd, Ruthven. Box 3, folder 182. 1941 Aug 7. https://collections.library.yale.edu/catalog/16538014.

APA, 6th edition

Tinker, Chauncey Brewster, 1876-1963. (["Box 3, folder 182"])(1941 Aug 7)[Todd, Ruthven]. https://collections.library.yale.edu/catalog/16538014.