MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Utah. Box 3, folder 87. n.d.. https://collections.library.yale.edu/catalog/2018228.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 3, folder 87"])(n.d.)[Utah]. https://collections.library.yale.edu/catalog/2018228.