Midlarsky, Elizabeth, and Eva Kahana. "Altruism, Well-Being, and Mental Health in Late Life." Altruism and Health: Perspectives from Empirical Research. : Oxford University Press, 2007-06-14. Oxford Scholarship Online. 2007-09-01. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195182910.001.0001/acprof-9780195182910-chapter-6>.
Midlarsky, E., & Kahana, E.(2007-06-14). Altruism, Well-Being, and Mental Health in Late Life. In Altruism and Health: Perspectives from Empirical Research. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195182910.001.0001/acprof-9780195182910-chapter-6.
Midlarsky, Elizabeth, and Eva Kahana. "Altruism, Well-Being, and Mental Health in Late Life." In Altruism and Health: Perspectives from Empirical Research. : Oxford University Press, 2007-06-14. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195182910.001.0001/acprof-9780195182910-chapter-6.
Midlarsky E, Kahana E. Altruism, Well-Being, and Mental Health in Late Life. In: Post SG. Altruism and Health: Perspectives from Empirical Research. Oxford University Press; 2007. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195182910.001.0001/acprof-9780195182910-chapter-6. Accessed May 22, 2013.