APA Zitierstil

Covey, S. R. (1989). The seven habits of highly effective people: Restoring the character ethic. New York: A Fireside Book.

Chicago Zitierstil

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: A Fireside Book, 1989.

MLA Zitierstil

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: A Fireside Book, 1989.

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