1. Andreoni, J., Gale, W.G., Scholz, J.K., 1996. Charitable contributions of time and money. Mimeographed, University of Wisconsin.
2. Interpersonal interaction and economic theory: the case of public goods;Bardsley;Annals of Public and Cooperative Economics,2000
3. Evidence on the volunteer labor supply of married women;Carlin;Southern Economic Journal,2001
4. Federal Tax Policy and Charitable Giving;Clotfelter,1985
5. The 1997 National Survey of Volunteering;Davis Smith,1998