1. Bluebond-Langner, M.: 1978, The Private Worlds of Dying Children, Princeton University Press, Princeton, New Jersey.
2. Carey, S.: 1985, Conceptual Change in Childhood, MIT Press, Cambridge, Massachusetts.
3. Nagy, M. H.: 1948, ‘The Child’s Theories Concerning Death’, Journal of Genetic Psychology 73, 3–27.
4. Nitschke, R., Humphrey, G. B., Sexaner, C. L., Catron, B., Wunder, S., and Jay, S.: 1982, ‘Therapeutic Choices Made by Patients with End-stage Cancer’, The Journal of Pediatrics 101, 471–476.
5. Plato: 1961, Apology, H. Tredennick (trans.), in E. Hamilton and H. Cairns (eds.) The Collected Dialogues of Plato, Princeton University Press, Princeton, New Jersey.