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. 3. 941-1428.
• See pp.1408-1409, no.4.Book: Russell, Charles Edward. 1926 English mezzotint portraits and their states from the invention of mezzotinting until the early part of the 19th century: Catalogue of Corrections of and Additions to Chaloner Smith's "British Mezotinto Portraits.". 2.
• See p.334, no.4.Book: Belknap, Waldron Phoenix. 1959 American Colonial Painting: Materials for a History.
• See pp.296-297, no.20.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. 13, p. 17.