For an interesting essay on public choice, available online in pdf format, see J. Mark Ramseyer, Public Choice (November 1995).

Works on public choice include:

Becker, G. "A Theory of Competition Among Pressure Groups for Political Influence," Quarterly Journal of Economics, vol. 98 (1983), pp. 371-400. 98 Q.J. Econ 371

Black, D., The Theory of Committees and Elections. Cambridge: Cambridge University Press, 1958.

Buchanan, J. M., "Rent-Seeking and Profit-Seeking," chapter 1 in Buchanan, J.M., Tollison, R.D., and Tullock, G. (eds.), Toward a Theory of the Rent-Seeking Society.College Station, Texas: Texas A&M University Press, 1980.

Buchanan, J. M. and Tullock, G., The Calculus of Consent. Ann Arbor: University of Michigan Press, 1962.

Anthony Downs, A., An Economic Theory of Democracy, (New York: Harper & Row, 1957)

Hardin, R., Collective Action. Baltimore and London: The Johns Hopkins Press, 1982.

Mueller, D.C., Public Choice II: A Revised Edition of Public Choice. Cambridge: Cambridge University Press, 1989.

Mueller, D.C., Perspectives on Public Choice: A Handbook. United Kingdom: Cambridge University Press, 1997.

Niskanen, W.A., Bureaucracy and Representative Government. Chicago and New York: Aldine Alterton Inc., 1971.

Olson, M. Jr, The Logic of Collective Action: Public Goods and the Theory of Groups. Cambridge, Massachusetts: Harvard University Press, 1965.

There is also a discussion of public choice theory in Chapter 19 of Price Theory.