Covey ,Stephen R. 7 habits of highly Effective People. Pocket Books.
Čikaški stil citiranjaCovey ,Stephen R. 7 Habits of Highly Effective People. London: Pocket Books.
MLA način citiranjaCovey ,Stephen R. 7 Habits of Highly Effective People. Pocket Books.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.