MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Portraits. Box 2, folder 68. 1902 Jul 1. https://collections.library.yale.edu/catalog/2017920.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 2, folder 68"])(1902 Jul 1)[Portraits]. https://collections.library.yale.edu/catalog/2017920.