Fritz, R. (2008). The power of a positive attitude: Discovering the key to success. American Management Association.
Chicago-Zitierstil (17. Ausg.)Fritz, Roger. The Power of a Positive Attitude: Discovering the Key to Success. New York: American Management Association, 2008.
MLA-Zitierstil (9. Ausg.)Fritz, Roger. The Power of a Positive Attitude: Discovering the Key to Success. American Management Association, 2008.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.