Isaac Newton (1966). “Sir Isaac Newton's Mathematical Principles of Natural Philosophy and His System of the World: The motion of bodies”, p.6, Univ of California Press
"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.