Eisenberg, N., Fabes, R.A., Miller, P.A., Fultz, J., Shell, R., Mathy, R.M., & Reno, R.R. (1989). "Relation of sympathy and personal distress to prosocial behavior: A multimethod study". Journal of Personality and Social Psychology, 57(1), 55–66. doi:10.1037/0022-3514.57.1.55 99.249.193.56
