1. Merriam-Webster, Inc. Webster’s ninth new collegiate dictionary. Springfield, MA: Author, 1986: 362.
2. Saunders WB. Dorland’s Illustrated Medical Dictionary. 27th ed. Philadelphia: Author, 1988.
3. Vaillant GE. The natural history of alcoholism: Causes, patterns and paths to recovery. Cambridge, MA: Harvard University Press, 1983.
4. Alexander BK. The disease and adapative models of addiction: A framework analysis. J of Drug Issues 1987; 20(1): 35–67.
5. American Psychiatric Association. Diagnostic and statistical manual of mental disorders. 3rd ed, rev. Washington, DC: Author, 1987.