Koenig, H. G. (2002). Purpose and power in retirement: New opportunities for meaning and significance. Templeton Foundation Press.
Chicago-Zitierstil (17. Ausg.)Koenig, Harold George. Purpose and Power in Retirement: New Opportunities for Meaning and Significance. Philadelphia, Pa: Templeton Foundation Press, 2002.
MLA-Zitierstil (9. Ausg.)Koenig, Harold George. Purpose and Power in Retirement: New Opportunities for Meaning and Significance. Templeton Foundation Press, 2002.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.