Leider, R. (2015). The power of purpose: Find meaning, live longer, better (Third Edition, Revised and Expanded.). Berrett-Koehler Publishers, Inc.
Chicago-Zitierstil (17. Ausg.)Leider, Richard. The Power of Purpose: Find Meaning, Live Longer, Better. Third Edition, Revised and Expanded. San Francisco: Berrett-Koehler Publishers, Inc, 2015.
MLA-Zitierstil (9. Ausg.)Leider, Richard. The Power of Purpose: Find Meaning, Live Longer, Better. Third Edition, Revised and Expanded. Berrett-Koehler Publishers, Inc, 2015.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.