MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Portraits. Box 4, folder 128. n.d.. https://collections.library.yale.edu/catalog/2025121.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 4, folder 128"])(n.d.)[Portraits]. https://collections.library.yale.edu/catalog/2025121.