"Constable". Book by Leslie Parris and Ian Fleming-Williams, Tate Gallery Publications, London, p. 380, Letter to William Purton (6 February 1836), 1993.
"The Federal and State Constitutions Colonial Charters, and Other Organic Laws of the States, Territories, and Colonies Now or Heretofore Forming the United States of America" compiled and edited by Newton Thorpe, Washington, DC : Government Printing Office, 1909.