Book: Smith, John Chaloner. 1884 British Mezzotinto Portraits; Being a Descriptive Catalogue of These Engravings from the Introduction of the Art to the early part of the present century. 1. 1-460.
• See p.401, no.258.Book: Belknap, Waldron Phoenix. 1959 American Colonial Painting: Materials for a History.
• See pp.288-289, no.14.Article: Fleischer, Roland E. 1987 "Gustavus Hesselius and Penn Family Portraits: A Conflict between Visual and Documentary Evidence". American Art Journal. 19 (3): 4-18.
• See fig. no. 10, p. 12.