Covey, S. R. (2004). The 8th habit: From effectiveness to greatness. Simon & Schuster, New Delhi.
Citazione stile Chigago Style (17a edizione)Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. Simon & Schuster, New Delhi, 2004.
Citatione MLA (9a ed.)Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. Simon & Schuster, New Delhi, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.