lower left in image: JM (in monogram); lower center in plate: JEALOUS MONSTER. / Publish'd Dec.r 8, 1778 by I. Mortimer
(Campbell Fine Art, London, 11 March 1993); Donald Vogler, Portland, OR; gift to NGA, 2017.
- Sunderland, John. "John Hamilton Mortimer: His Life and Works," Walpole Society 52 (1986): no. 140.14