APA Zitierstil

Covey, S. R. (2004). The 7 habits of highly effective people. Pocket books.

Chicago Zitierstil

Covey, Stephan R. The 7 Habits of Highly Effective People. London: Pocket books, 2004.

MLA Zitierstil

Covey, Stephan R. The 7 Habits of Highly Effective People. Pocket books, 2004.

Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.