Moriarty, T. (1975). Crime, commitment, and the responsive bystander: Two field experiments. Journal of Personality and Social Psychology, 31, 2, 370-376.

Hine, D. W., & Gifford, R. (1991). Fear appeals, individual differences, and environmental concern. Journal of Environmental Education, 23, 1, 36-41.

Bachman, W. , & Katzev, R. (1982). The effects of non-contingent free bus tickets and personal commitment on urban bus ridership. Transportation Research, 16A, 2, 103-108.

Austin, W. (1979). Sex differences in bystander intervention in a theft. Journal of Personality and Social Psychology, 37, 11, 2110-2120.

Lipsitz, A., Kallmeyer, K., Ferguson, M., & Abas, A. (1989). Counting on blood donors: Increasing the impact of reminder calls. Journal of Applied Social Psychology, 19, 13, 1057-1067.

Cobern, M. K., Porter, B.E., Leeming, F.C., & Dwyer, W.O. (1995). The effect of commitment on adoption and diffusion of grass cycling. Special Issue: Litter control and recycling. Environment and Behavior, 27, 2, 213-232.

DeLeon, I. G., & Fuqua, R. W. (1995). The effects of public commitment and group feedback on curbside recycling. Special Issue: Litter control and recycling. Environment and Behavior, 27, 2, 233-250.

Hornik, J., Cherian, J., Madansky, M., & Narayana, C. (1995). Determinants of recycling behavior: A synthesis of research results. The Journal of Socio-Economics, 24, 1, 105-127.

Pittman, T. S., Pallak, M. S., Riggs, J. M., & Gotay, C. C. (1981). Increasing blood donor pledge fulfillment. Personality and Social Psychology Bulletin, 7, 2, 195-200.

Wang, T. H. & Katzev, R. D. (1990). Group commitment and resource conservation: Two field experiments on promoting recycling. Journal of Applied Social Psychology, 20, 4, Part 1, 265-275.