1. 1. P. J. Fitzgerald., Salmond on Jurisprudence. (Universal law publication)
   2. Ronald Dworkin., Law’s Empire. (Harvard University press)
   3. George Whitecross Paton., A textbook of jurisprudence. (Clarendon press)
   4. John Finnis., Natural Law and Natural Rights. (Oxford university press) 
   5. Richard A. Posner., The Problems of Jurisprudence. (Harvard University press)