1. Osler W. Science and Immortality. Boston/Cambridge: Houghton, Mifflin/Riverside; 1904.
2. Weiss SC, Emanuel LL, Fairclough DL, Emanuel EJ. Understanding the experience of pain in terminally ill patients. Lancet. 2001;357:1311–5.
3. Jennings B, Rundes T, D’Onofrio C, et al. Access to hospice care: expanding boundaries, overcoming barriers. Hastings Cent Rep. 2003;33(2):S3–4.
4. Capron AM. Definition and determination of death: II. Legal issues in pronouncing death. In: Reich WT, editor. Encyclopedia of bioethics. New York: Simon & Schuster MacMillan; 1995. p. 536.
5. Encyclopaedia Brittanica 1st edition 1768, Encyclopaedia Brittanica Inc., Edinburgh, United Kingdom. Vol. 2. 1768. p. 309.