Covey, S. R. (1990). Principle centred leadership. Simon & Schuster.
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Chicago Style (17th ed.) Citation
Covey, Stephen R. Principle Centred Leadership. London: Simon & Schuster, 1990.
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MLA引文
Covey, Stephen R. Principle Centred Leadership. Simon & Schuster, 1990.
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警告：這些引文格式不一定是100％准確.