1. Cole, T., 1992.The Journey of Life. New York: Cambridge University Press.
2. Butler, R. andGleason, H., 1985.Productive Aging: Enhancing Vitality in Later Life. New York: Springer Publishing Company.
3. Callahan, D., 1987.Setting Limits: Medical Goals in an Aging Society. New York: Simon and Schuster.
4. Longman, P., 1987.Born to Pay: The New Politics of Aging in America. Boston: Houghton Mifflin.
5. Bass, S., Caro. F., Chen, P. (eds.), 1993.Achieving a Productive Aging Society. Westport, CT: Auburn House.