Covey, S. R. (1989). The 7 habits of highly effective people: Restoring the character ethic. Pocket books.
シカゴスタイル引用形Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. London: Pocket books, 1989.
MLA引用形式Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Pocket books, 1989.
警告: この引用は必ずしも正確ではありません.