MLA

Trumbull, John, 1756-1843. Unidentified. Box 9, folder 127 | reel 6U. 1793-1896, undated. https://collections.library.yale.edu/catalog/10015543.

APA, 6th edition

Trumbull, John, 1756-1843. (["Box 9, folder 127 | reel 6U"])(1793-1896, undated)[Unidentified]. https://collections.library.yale.edu/catalog/10015543.