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            - 
              Weiss, R. S., & Bass, S. A. (2002). Challenges of the Third Age: Meaning and Purpose in Later Life. Oxford England, New York: Oxford University Press.
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            - 
              Weiss, Robert S.; Bass, Scott A. (2002). Challenges of the third age. Meaning and purpose in later life. Oxford: Oxford University Press.
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            - 
              Weiss, Robert Stuart; Bass, Scott A. (2002): Challenges of the third age. Meaning and purpose in later life. Oxford, New York: Oxford University Press.
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