1. Giving With Impure Altruism: Applications to Charity and Ricardian Ambivalence;James Andreoni;Journal of Political Economy,1989
2. Trust and Rationality;Judith Baker;Pacific Philosophical Quarterly,1987
3. The Gains of Giving: For Area's Volunteers, Investing Time Pays a Rich Reward;Scott Bowles;Washington Post,1996
4. Individual Level Evidence for the Causes and Consequences of Social Capital;John Brehm;American Journal of Political Science,1997