MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Portraits. Box 3, folder 112. [1931]. https://collections.library.yale.edu/catalog/2018321.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 3, folder 112"])([1931])[Portraits]. https://collections.library.yale.edu/catalog/2018321.