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- Black, Henry Campbell (1990), Black's Law Dictionary, 6th ed, west publishing company.
- Constitution of the United States, 1789.
- UN, United Nations Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment (UNCAT), 10 December 1984.
- Walker, David M (1989), the Oxford companion to law, Oxford, Clarendon press.