APA(7版)引用形式
Covey, S. R. (1991). Principle-centered leadership. Pocket books.
Chicagoスタイル(17版)引用形式
Covey, Stephen R. Principle-centered Leadership. London: Pocket books, 1991.
MLA(9版)引用形式
Covey, Stephen R. Principle-centered Leadership. Pocket books, 1991.
警告: この引用は必ずしも正確ではありません.