MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Zion. Box 2, folder 50-51. 1903-29, n.d.. https://collections.library.yale.edu/catalog/2017865.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 2, folder 50-51"])(1903-29, n.d.)[Zion]. https://collections.library.yale.edu/catalog/2017865.