Social comparisons:
Festinger, L. (1954). A theory of social comparison processes. Human Relations, 7, 117–140. doi:10.1177/001872675400700202
Biel, A., & Thogersen, J. (2007). Activation of social norms in social dilemmas: A review of the evidence and reflections on the implications for environmental behavior. Journal of Economic Psychology, 28, 93–112. doi:10.1016/j.joep.2006.03.003
Cialdini, R. B. (2003). Crafting normative messages to protect the environment. Current Directions in Psychological Science, 12(4), 105–109. doi:10.1111/1467-8721.01242
Social norms and networks:
Thøgersen, J. (2008). Social norms and cooperation in real-life social dilemmas. Journal of Economic Psychology, 29, 458–472. doi: 10.1016/j.joep.2007.12.004
Schultz, P. W., Nolan, J. M., Cialdini, R. B., Goldstein, N. J., & Griskevicius, V. (2007). The constructive, destructive, and reconstructive power of social norms. Psychological Science, 18, 429–434. doi:10.1111/ j.1467-9280.2007.01917.x
Rogers, E. M. (1983). Diffusion of innovations (3rd ed.). New York, NY: Free Press.
Perceived inequity:
Kerr, N. L. (1983). Motivation losses in small groups: A social dilemma analysis. Journal of Personality and Social Psychology, 45, 819–828. doi:10.1037/0022-3514.45.4.819
Aquino, K., Steisel, V., & Kay, A. (1992). The effects of resource distribution, voice, and decision framing on the provision of public goods. Journal of Conflict Resolution, 36, 665–687. doi:10.1177/ 0022002792036004003
Olson, M. L., Jr. (1965). The logic of collective action: Public goods and the theory of groups. Cambridge, MA: Harvard University Press.