1. Olson, M. 1982. The rise and decline of nations: Economic growth, stagflation, and social rigidities. New Haven, CT: Yale University Press.
2. Putnam, R. 1993. Making democracy work: Civic traditions in modem Italy. Princeton, NJ: Princeton University Press.
3. Tocqueville, A. de. 1969. Democracy in America, edited by J. P. Maier, translated by G. Lawrence. Garden City, NY: Anchor Books.
4. Wuthnow, R. 1994. Sharing the journey: Support groups and America’s new quest for community. New York: The Free Press.