Covey, S. R. (2004). The 8th habit: From effectiveness to greatness. Free Press.
芝加哥风格引文Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. New York: Free Press, 2004.
MLA引文Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. Free Press, 2004.
警告：这些引文格式不一定是100％准确.