References
- The quotable Doctor Karl. Mayo Alumnus 1979 Jul: 15: 13
- Every ninth American is over 65 according to Brotman US Senate report. Newsletter of the American Geriatric Society, 1980 Jul
- Katzman R. Dementias. Postgrad Med 1978 Aug: 64: 119–25
- Butler RN. As quoted in: Long Term Care 1980 Jul 18; 9: 1
- Jowett B, transl. The dialogues of Plato. Chicago: Encyclopaedia Britannica Inc. 1952: 296