Covey, S. R. (2009). The 7 habits of highly effective people.
Chicago Style (17th ed.) CitationCovey, Stephen R. The 7 Habits of Highly Effective People. 2009.
MLA引文Covey, Stephen R. The 7 Habits of Highly Effective People. 2009.
警告:這些引文格式不一定是100%准確.