MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Utah. Box 2, folder 66. 1933. https://collections.library.yale.edu/catalog/2017915.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 2, folder 66"])(1933)[Utah]. https://collections.library.yale.edu/catalog/2017915.