Covey, S. R. (1989). The seven habits of highly effective people: Restoring the character ethic. New York: A Fireside Book.
Čikaški stil citiranjaCovey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: A Fireside Book, 1989.
MLA način citiranjaCovey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: A Fireside Book, 1989.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.