Covey Stephen R. (2004). Seven habits Of Highly Effective People. Simon Schuster.
Chicagoスタイル(17版)引用形式Covey Stephen R. Seven Habits Of Highly Effective People. London: Simon Schuster, 2004.
MLA(9版)引用形式Covey Stephen R. Seven Habits Of Highly Effective People. Simon Schuster, 2004.
警告: この引用は必ずしも正確ではありません.