Carkhuff, R. R. (1973). The art of helping. Human Resource Development Press.
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Citação norma Chicago
Carkhuff, Robert R. The Art of Helping. Amherst, Massachuttes: Human Resource Development Press, 1973.
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Citação norma MLA
Carkhuff, Robert R. The Art of Helping. Human Resource Development Press, 1973.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.