MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Utah. Box 1, folder 14. 1871, n.d.. https://collections.library.yale.edu/catalog/2017579.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1, folder 14"])(1871, n.d.)[Utah]. https://collections.library.yale.edu/catalog/2017579.