Covey, S. R. (1991). Principle-Centered Leadership (1. ed.). Simon & Schuster.
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Citação norma Chicago
Covey, Stephen R. Principle-Centered Leadership. 1. ed. New York: Simon & Schuster, 1991.
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Citação norma MLA
Covey, Stephen R. Principle-Centered Leadership. 1. ed. Simon & Schuster, 1991.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.