Piff, Paul K.; Kraus, Michael W.; Côté, Stéphane; Cheng, Bonnie Hayden; Keltner, Dacher (November 2010). "Having less, giving more: The influence of social class on prosocial behavior". Journal of Personality and Social Psychology. 99 (5): 771–784. doi:10.1037/a0020092. PMID20649364.
Przepiorka, Wojtek; Liebe, Ulf (July 2016). "Generosity is a sign of trustworthiness—the punishment of selfishness is not". Evolution and Human Behavior. 37 (4): 255–262. doi:10.1016/j.evolhumbehav.2015.12.003. hdl:1874/344110.
handle.net
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Przepiorka, Wojtek; Liebe, Ulf (July 2016). "Generosity is a sign of trustworthiness—the punishment of selfishness is not". Evolution and Human Behavior. 37 (4): 255–262. doi:10.1016/j.evolhumbehav.2015.12.003. hdl:1874/344110.
Piff, Paul K.; Kraus, Michael W.; Côté, Stéphane; Cheng, Bonnie Hayden; Keltner, Dacher (November 2010). "Having less, giving more: The influence of social class on prosocial behavior". Journal of Personality and Social Psychology. 99 (5): 771–784. doi:10.1037/a0020092. PMID20649364.