1. Bagshaw, Sean M., Steve A.R. Webb, Anthony Delaney, Carol George, David Pilcher, Graeme K. Hart, and Rinaldo Bellomo. 2009. Very old patients admitted to intensive care in Australia and New Zealand: A multi-centre cohort analysis. Critical Care 13(2): R45.
2. Barry, Robert L., and Gerard V. Bradley (eds.). 1991. Set no limits: A rebuttal to Daniel Callahan’s proposal to limit health care for the elderly. Urbana: University of Illinois Press.
3. Binstock, Robert H., and Stephen G. Post. 1991. Too old for health care? Controversies in medicine, law, economics, and ethics. Baltimore: The Johns Hopkins University Press.
4. Buchanan, Allen E. 1988. Advance directives and the personal identity problem. Philosophy and Public Affairs 17(4): 277–302.
5. Buchanan, Allen E., and Dan W. Brock. 1990. Deciding for others: The ethics of surrogate decision-making. New York: Cambridge University Press.