Hellen Derrickson 
Group Therapy [PDF ebook] 
Theory, Practices and Effectiveness

As the power of talk therapy was beginning to be discovered, it became clear at about the same time that it was very difficult to provide individual therapy for many people at the same time. Such therapy was extremely time-consuming and costly of human energy. This book reviews group therapies, personal growth groups, and support groups. It discusses the theories, practices and effectiveness of group therapy.