Young, M. E. (2009). Learning the art of helping: Building blocks and techniques (4th ed.). Merrill/Pearson.
Citace podle Chicago (17th ed.)Young, Mark E. Learning the Art of Helping: Building Blocks and Techniques. 4th ed. Upper Saddle River, N.J: Merrill/Pearson, 2009.
Citace podle MLA (9th ed.)Young, Mark E. Learning the Art of Helping: Building Blocks and Techniques. 4th ed. Merrill/Pearson, 2009.
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