MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Green River. Box 1, folder 33. 1929. https://collections.library.yale.edu/catalog/2017685.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1, folder 33"])(1929)[Green River]. https://collections.library.yale.edu/catalog/2017685.