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2. Buchanan, J. M. (1977). Letter to Vincent Ostrom, 18 March 1977, James Buchanan Archives. George Mason University.
3. Buchanan, J. M. (1979). What Should Economists Do? Indianapolis: Liberty Press.
4. Buchanan, J. M. (1991). The Economics and the Ethics of Constitutional Order. Ann Arbor: University of Michigan Press.
5. Buchanan, J. M. (1999). Natural and Artifactual Man. In The Collected Works of James M. Buchanan, Volume I: The Logical Foundations of Constitutional Liberty (pp. 246–259). Indianapolis: Liberty Fund.