1. Wesley, P., Oskamp, S., & Mainieri, T. (1995). Who recycles and when? A review of personal and situational factors. Journal of Environmental Psychology, 15, 105-121.
2. Williams, E. (1991). College students and recycling: Their attitudes and behaviors. Journal of College Student Development, 32, 86-88.
3. Young, R. (1984). Motivating people to recycle: The use of incentives. Resource Recycling, 42, 14-15.
4. Young, R. (1985). Encouraging environmentally appropriate behavior: The role of intrinsic motivation. Journal of Environmental Systems, 15, 281-292.
5. Young, R. (1988). Exploring the difference between recyclers and non recyclers: The role of information. Journal of Environmental Systems, 18, 341-351.