Carkhuff, R. R. (2009). The art of helping (9th ed.). HRD Press.
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Chicago Style (17th ed.) Citation
Carkhuff, Robert R. The Art of Helping. 9th ed. Amherst, Mass.: HRD Press, 2009.
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MLA引文
Carkhuff, Robert R. The Art of Helping. 9th ed. HRD Press, 2009.
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警告：這些引文格式不一定是100％准確.