MLA

Dellenbaugh, Frederick Samuel, 1853-1935. California. Box 1, folder 16. n.d.. https://collections.library.yale.edu/catalog/2017582.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1, folder 16"])(n.d.)[California]. https://collections.library.yale.edu/catalog/2017582.