Sutton, S. (1992). Shock tactics and the myth of the inverted U. British Journal of Addiction, 87, 4, 517-519.

Sherer, M. & Rogers, R. W. (1984). The role of vivid information in fear appeals and attitude change. Journal of Research in Personality, 18, 3, 321-334.

Keller, P. A. & Block, L. G. (1995). Increasing the persuasiveness of fear appeals: The effect of arousal and elaboration. Journal of Consumer Research, 22, 4, 448-459.

Roser, C. & Thompson, M. (1995). Fear appeals and the formation of active publics. Journal of Communication, 45, 1, 103-121.

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.

Cialdini, R. B. & Baumann, D. J. (1981). Littering: A new unobtrusive measure of attitude. Social Psychology Quarterly, 44, 3, 254-259.

Durdan, C. A., Reeder, G. D. & Hecht, P. R. (1985). Litter in a university cafeteria: Demographic data and the use of prompts as an intervention strategy. Environment and Behavior, 17, 3, 387-404.

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.

Soler, C. (1996). Ecologically friendly buying--theoretical implications of a phenomenological perspective. Scandinavian Journal of Management, 12, 3, 275-289.

Geller, E. S. (1973). Prompting anti-litter behaviors. Proceedings of the Annual Convention of the American Psychological Association, 907-908.