1. AARP. (1987). A profile of older Americans. Long Beach, CA: American Association of Retired Persons.
2. & (1980). Concepts and issues of mental health and aging. In & (Eds.), Handbook of mental health and aging (pp. 3–33). Englewood Cliffs, NJ: Prentice-Hall.
3. The Epidemiology of Depression in an Elderly Community Population
4. (1969). The structure of psychological well-being. Chicago: Aldine.
5. Quality of life of adults with chronic illness: A psychometric study