Covey, S. R. The 7 habits of highly effective people: Restoring the character ethic (Revised edition.).
Chicago-Zitierstil (17. Ausg.)Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Revised edition.
MLA-Zitierstil (8. Ausg.)Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Revised edition.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.