Butler, Robert N. (1985): Health, Productivity, and Aging: An Overview. In: Butler, Robert N.; Gleason, Herbert P. (Hrsg.): Productive Aging: Enhancing Vitality in Later Life, New York: Springer, S. 1-13.
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Butler, R. N. (1985). Health, Productivity, and Aging: An Overview. New York: Springer. Productive Aging: Enhancing Vitality in Later Life, pp. 1-13.
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