Covey, S. R. (2004). The 8th habit: From effectiveness to greatness. Free Press.
Chicago Style (17. basım) AtıfCovey, Stephen R. The 8th Habit: From Effectiveness to Greatness. New York: Free Press, 2004.
MLA (8th ed.) AtıfCovey, Stephen R. The 8th Habit: From Effectiveness to Greatness. Free Press, 2004.
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