1. The collected works of James M. Buchanan;J. Buchanan,2001
2. Hayek, F. A. (1960). The constitution of liberty. Chicago: University of Chicago Press.
3. Hayek, F. A. (1973). Law, legislation and liberty. Chicago: University of Chicago Press.
4. McKenzie, R., & Tullock, G. (1989). The new world of economics. Homewood: Irwin.
5. Nozick, R. (1974). Anarchy, state and utopia. New York: Basic Books.