Covey, S. R. (1990). Principle centred leadership. Simon & Schuster.
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Dyfyniad Arddull Chicago
Covey, Stephen R. Principle Centred Leadership. London: Simon & Schuster, 1990.
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Dyfyniad MLA
Covey, Stephen R. Principle Centred Leadership. Simon & Schuster, 1990.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.