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8H. L. A. Hart, The concept of law. 2nd , Oxford: Clarendon Press, 1994.
9Dworkin, Ronald, Law's Empire. Oxford and Portland: Hart Publishing, 2000.
10Kenneth Einar Himma, "Inclusive Legal Positivism", in The Oxford Handbook of Jurisprudence and Philosophy of Law. Jules L. Coleman & Scott Shapiro ed. , Oxford: Oxford University Press, 2002.