Louis Agassiz (1857). “Contributions to the Natural History of the United States of America: pt. I. Essay on classification. pt. II. North American Testudinata. 1857”, p.170
"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.