Covey, S. R. (2004). 7 habits of highly effective people. Pocket books.
シカゴスタイル引用形Covey, Stephen R. 7 Habits of Highly Effective People. London: Pocket books, 2004.
MLA引用形式Covey, Stephen R. 7 Habits of Highly Effective People. Pocket books, 2004.
警告: この引用は必ずしも正確ではありません.