Schultz, P. W., Oskamp, S., & Mainieri, T. (1995). Who recycles and when? A review of personal and situational factors. Journal of Enviornmental Psychology, 15, 2, 105-121.

Kim, S. M. (1995). An investigation of strategies, incentives, and operational characteristics of recycling programs. Dissertation Abstracts International: Section B: The Sciences and Engineering, 56, 4-B,