MLA

Koch, Frederick R. (Frederick Robinson). Music/Dolly. Berceuse. Box 321, folder 1725. [ca. 1862]. https://collections.library.yale.edu/catalog/16601874.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 321, folder 1725"])([ca. 1862])[Music/Dolly. Berceuse]. https://collections.library.yale.edu/catalog/16601874.