MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Zion. Box 3, folder 79. n.d.. https://collections.library.yale.edu/catalog/2018218.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 3, folder 79"])(n.d.)[Zion]. https://collections.library.yale.edu/catalog/2018218.