Covey, S. R. (2004). The 7 habits of highly effective people. Pocket Books.
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Dyfyniad Arddull Chicago
Covey, Stephen R. The 7 Habits of Highly Effective People. London: Pocket Books, 2004.
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Dyfyniad MLA
Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.