MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Ohio. Box 1, folder 21. 1901 Nov 20. https://collections.library.yale.edu/catalog/2017626.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1, folder 21"])(1901 Nov 20)[Ohio]. https://collections.library.yale.edu/catalog/2017626.