Stephen R. Covey. (2004). The 8th habit: From effectiveness to greatness. Free Press.
シカゴスタイル引用形Stephen R. Covey. The 8th Habit: From Effectiveness to Greatness. New York: Free Press, 2004.
MLA引用形式Stephen R. Covey. The 8th Habit: From Effectiveness to Greatness. Free Press, 2004.
警告: この引用は必ずしも正確ではありません.