MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Yosemite. Box 1, folder 17. n.d.. https://collections.library.yale.edu/catalog/2017583.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1, folder 17"])(n.d.)[Yosemite]. https://collections.library.yale.edu/catalog/2017583.