Covey, S. R. (2004). The 8th habit: From effectiveness to greatness. Simon & Schuster, New Delhi.
Chicago-viite (17. p.)Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. Simon & Schuster, New Delhi, 2004.
MLA-viite (9. p.)Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. Simon & Schuster, New Delhi, 2004.
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