MLA

Dellenbaugh, Frederick Samuel, 1853-1935. New Mexico. Box 2, folder 40. 1907, n.d.. https://collections.library.yale.edu/catalog/2017807.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 2, folder 40"])(1907, n.d.)[New Mexico]. https://collections.library.yale.edu/catalog/2017807.