1. Barro, Robert J. ?The Control of Politicians: An Economic Model.? Public Choice (Spring) 1973.
2. Buchanan, James M. and Tullock, Gordon. The Calculus of Consent. Ann Arbor: University of Michigan Press, 1971.
3. Congressional Role Call. Washington: U.S. Government Printing Office, selected years.
4. Council of State and Local Governments. Book of the States: 1976?1977. Lexington, Kentucky: Iron Works Pike, selected years.
5. Crain, W. Mark. ?On the Structure and Stability of Political Markets.? Journal of Political Economy, forthcoming.