MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Green River. Box 4, folder 142. n.d.. https://collections.library.yale.edu/catalog/2025287.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 4, folder 142"])(n.d.)[Green River]. https://collections.library.yale.edu/catalog/2025287.