Covey R. Stephen. (1997). The 7 habits of highly effective people. Pocket Books.
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Citação norma Chicago
Covey R. Stephen. The 7 Habits of Highly Effective People. London: Pocket Books, 1997.
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Citação norma MLA
Covey R. Stephen. The 7 Habits of Highly Effective People. Pocket Books, 1997.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.