Covey, S. R. (1999). The 7 habits of highly effective families. Simon and Schuster.
シカゴスタイル引用形Covey, Stephen R. The 7 Habits of Highly Effective Families. UK: Simon and Schuster, 1999.
MLA引用形式Covey, Stephen R. The 7 Habits of Highly Effective Families. Simon and Schuster, 1999.
警告: この引用は必ずしも正確ではありません.