1. Achenbaum, W.A. (1986). The meaning of risk, rights, and responsibility in aging America. In Thomas R. Cole & Sally Gadow (Eds.), What does it mean to grow old? Reflections from the humanities (pp. 63–98). Durham Duke: University Press.
2. Allport, G.W. (1979). The nature of prejudice. New York: Addison-Wesley Publishing Company, Inc.
3. Aristotle (1984). The complete works of Aristotle: the revised Oxford translation, ed. Jonathan Barnes, vol.’s 1–2. Princeton: Princeton University Press.
4. Battin, M.P. (1987). Age rationing and the just distribution of health care: is there a duty to die?. Ethics, 97(2), 317–340.
5. Fendrich, L. (2014, November 14). The forever professors. The Chronicle of Higher Education: The Chronicle Review,
http://chronicle.com/article/The-Forever-Professors/149965/
. Accessed 7 June 2015.