Reiter, S. M. & Samuel, W. (1980). Littering as a function of prior litter and the presence or absence of prohibitive signs . Journal of Applied Social Psychology, 10, 1, 45-55.

Kilbourne, B. K. & Kilbourne, M. T. (1984). Norms of social conduct and the foot-in-the-door. Journal of Social Psychology, 123, 1, 13-20.

Reno, R. R., Cialdini, R. B. & Kallgren, C. A. (1993). The transsituational influence of social norms. Journal of Personality and Social Psychology, 64, 1, 104-112.

Crump, S. L., Nunes, D. L. & Crossman, E. K. (1977). The effects of litter on littering behavior in a forest environment. Environment and Behavior, 9, 1, 137-146.

Wagstaff, M. C. & Wilson, B. E. (1988). The evaluation of litter behavior modification in a river environment. Journal of Environmental Education, 20, 1, 39-44.

Perkins, H. M., Crown, E. M., Rigakis, K. B. & Eggertson, B. S. (1992). Attitudes and behavioral intentions of agricultural workers toward disposable protective coveralls. Clothing and Textiles Research Journal, 11, 1, 67-73.

Minton, A. P. & Rose, R. L. (1997). The effects of environmental concern on environmentally friendly consumer behavior: An exploratory study. Journal of Business Research, 40, 1, 37-48.

Geller, E. S., Witmer, J. F. & Tuso, M. A. (1977). Environmental interventions for litter control.. Journal of Applied Psychology, 62, 3, 344-351.

Grasmick, H. G., Bursik, R. J. & Kinsey, K. A. (1991). Shame and embarrassment as deterrents to noncompliance with the law: The case of an antilittering campaign. Environment and Behavior, 23, 2, 233-251.

Midden, C. J. & Ritsema, B. S. (1983). The meaning of normative processes for energy conservation. Journal of Economic Psychology, 4, 1-2, 37-55.