MLA

Brady, Mathew B., approximately 1823-1896. Boys posed standing on rocks near a waterfall, identified as Burnt Mill. Box 36, folder 1809. circa 1920. https://collections.library.yale.edu/catalog/33109354.

APA, 6th edition

Brady, Mathew B., approximately 1823-1896. (["Box 36, folder 1809"])(circa 1920)[Boys posed standing on rocks near a waterfall, identified as Burnt Mill]. https://collections.library.yale.edu/catalog/33109354.