MLA

Trumbull, John, 1756-1843. More Recent Sketches. Box 1 | Folder 2. [circa 1780]. https://collections.library.yale.edu/catalog/16169039.

APA, 6th edition

Trumbull, John, 1756-1843. (["Box 1 | Folder 2"])([circa 1780])[More Recent Sketches]. https://collections.library.yale.edu/catalog/16169039.