Willingham, R. (1968). How to speak so people will listen. Word Books.
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Citação norma Chicago
Willingham, Ron. How to Speak so People Will Listen. Waco, Tex.: Word Books, 1968.
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Citação norma MLA
Willingham, Ron. How to Speak so People Will Listen. Word Books, 1968.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.