1. Alter, K. 2003. Social enterprise: A typology of the field in Latin America. Inter-American Development Bank.
2. Barkin, D. 1996. Ecotourism: A tool for sustainable development in an era of international integration? In J. Miller (ed.), The ecotourism equation: Measuring the impacts. Yale School of Forestry and Environmental Studies Bulletin No. 99.
3. Berlin, I. 1997. Does political theory still exist? In H. Hardy and R. Hausheer (eds), The proper study of mankind: An anthology of essays. New York: Farrar, Straus and Giroux.
4. Calhoun, C. 1992. Habermas and the public sphere. In C. Calhoun (ed.), Habermas and the public sphere. Cambridge, MA: MIT Press.
5. Clotfelter, C. 2000. Do lotteries hurt the poor? Well, yes and no. Summary of testimony given to a House Select Committee on a State Lottery, 19 April 2000. Available:
http://www.pubpol.duke.edu
/people/faculty/clotfelter/lottsum.pdf. Posted 28 April 2000.