6David Walker, The Oxford Companion to Law, New York: Oxford University Press, p. 754.
7Ruth Gavison, Comment in Issues in Contemporary Legal Philosophy, ed. Ruth Gavison, Oxford: Clarendon Press, 1986, pp. 21-34.
8Edgar Bodenheimer, Jurisprudence, Cambridge: Harvard University Press, 1974, pp. 91-95.
9Hubert Rottleuthner, Legal Theory and Social Science, in The Theory of Legal Science, ed. by Aleksander Peczenik,Lars Lindahl, and Bert van Roermund, Dordrecht: D Reidel Publishing Company, 1984, p. 525.
10Dennis Lloyd, Idea of Law, New York: Viking Penguin Inc., 1981, pp. 105- 108.
