Cita APA (7a ed.)

Bass, S. A., & Weiss, R. S. (2002). Challenges of the third age: Meaning and purpose in later life. Oxford University Press.

Cita Chicago Style (17a ed.)

Bass, Scott A., y Robert Stuart Weiss. Challenges of the Third Age: Meaning and Purpose in Later Life. Oxford [England] ; New York: Oxford University Press, 2002.

Cita MLA (8a ed.)

Bass, Scott A., y Robert Stuart Weiss. Challenges of the Third Age: Meaning and Purpose in Later Life. Oxford University Press, 2002.