SHULMAN, L. (1984). The skills of helping: Individuals and groups.-- Ed.2. F E Peacock Pub.
Lua i Stíl Chicago (17ú heag.)SHULMAN, Lawrence. The Skills of Helping: Individuals and Groups.-- Ed.2. Itasca: F E Peacock Pub, 1984.
Lua MLA (9ú heag.)SHULMAN, Lawrence. The Skills of Helping: Individuals and Groups.-- Ed.2. F E Peacock Pub, 1984.
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