1. Amato, P. R. (1985). An investigation of planned helping behavior. Journal of Research in Personality, 19, 232–252. doi: 10.1016/0092-6566(85)90031-5 .
2. Aydinli, A., Bender, M., & Chasiotis, A. (2013). Helping and volunteering across cultures: Determinants of prosocial behavior. Online Readings in Psychology and Culture, Unit 5. Retrieved from http://scholarworks.gvsu.edu/orpc/vol5/iss3/6 .
3. Bargh, J. A. (1989). Conditioned automaticity: Varieties of automatic influence in social perception and cognition. In J. S. Uleman & J. A. Bargh (Eds.), Unintended thought (pp. 3–51). New York: Guilford.
4. Batson, C. D. (1991). The altruism question: Towards a social–psychological answer. Hillsdale, NJ: Lawrence Erlbaum Associates.
5. Batson, C. D., Ahmad, N., Lishner, D. A., & Tsang, J. (2002). Empathy and altruism. In C. R. Snyder & S. L. Lopez (Eds.), Handbook of positive psychology (pp. 485–498). New York, NY: Oxford University Press.