MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Green River. Box 1, folder 10-11. 1871, n.d.. https://collections.library.yale.edu/catalog/2017549.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1, folder 10-11"])(1871, n.d.)[Green River]. https://collections.library.yale.edu/catalog/2017549.