References
- http://en.wikipedia.org/wiki/Mary_Martha_Pearson
- Collections for a Genealogical Account of the Family of Comberbach by George William Marshall, 1866
- http://en.wikipedia.org/wiki/British_Institution
- The Forger’s Spell: A True Story of Vermeer, Nazis, and the Greatest Art Hoax of the Twentieth Century (P.S.) by Edward Dolnick (Jun 16, 2009)
- The Art Forger: A Novel by B. A. Shapiro (May 21, 2013)
- http://www.bbc.co.uk/arts/yourpaintings/paintings/lady-caroline-hill-17961881-134312
- http://en.wiktionary.org/wiki/lady
- http://www.familytreecircles.com/descended-from-sir-rowland-hill-of-penny-post-fame-lots-of-people-claim-this-but-how-many-are-true-41189.html
- http://history1800s.about.com/od/1800sglossary/g/pennypostdef.htm