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Zahavi, A. (). „Altruism as a handicap – The limitations of kin selection and reciprocity”. Avian Biol. 26 (1): 1–3. doi:10.2307/3677205. JSTOR3677205.
Brown, S. L.; Brown, R.; House, J. S.; Smith, D. M. (). „Coping with spousal loss: Potential buffering effects of self-reported helping behavior”. Personality and Social Psychology Bulletin. 34 (6): 849–861. doi:10.1177/0146167208314972. PMID18344495.
Post, S. G. (). „Altruism, Happiness, and Health: It's Good to Be Good”. International Journal of Behavioral Medicine. 12 (2): 66–77. doi:10.1207/s15327558ijbm1202_4. PMID15901215.
Oman, D.; Thoresen, C. E.; McMahon, K. (). „Volunteerism and mortality among the community-dwelling elderly”. Journal of Health Psychology. 4 (3): 301–316. doi:10.1177/135910539900400301. PMID22021599.