Covey, S. R. (2004). The seven habits of highly effective people. Simon and Schuster.
शिकागो स्टाइल उद्धरणCovey, Stephen R. The Seven Habits of Highly Effective People. London: Simon and Schuster, 2004.
एमएलए उद्धरणCovey, Stephen R. The Seven Habits of Highly Effective People. Simon and Schuster, 2004.
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