The best book we have on this subject, according to Jerome Frank, is "The Theory and Practice of Group Psychotherapy" by Irvin D. Yalom, which has been used internationally for decades as the primary reference book for group psychotherapy.

The American Journal of Psychiatry characterized it as one of the ten most influential psychiatric publications of the 1970s when it was first published. For this fully revised and expanded fifth edition, released in the U.S. in the summer of 2005, professor Irvin Yalom collaborated with his student, professor Molyn Lesz, to present the most current guidelines in the research and application of group psychotherapy.

Exploring the latest developments and drawing their material from new research of the past decade and from their extensive personal clinical experience and knowledge, this revised edition includes new sections on brief group therapy, internet therapeutic groups, cultural specifics, trauma, managed care, and specialized and structured groups (e.g., groups for addictions and for patients with physical illnesses).

Irvin Yalom and Molyn Lesz have fully modernized the style and content of the chapters, added new clinical examples, while also retaining clinical and research information that remains valid. The text is enriched with vivid examples from the thousands of group sessions they have facilitated over the decades they have practiced group psychotherapy.

"The Theory and Practice of Group Psychotherapy" is a handbook that combines rich scientific information with vibrant description. This edition represents the most up-to-date, comprehensive, and in-depth study of group psychotherapy available today. It covers all the major trends and useful methods that anyone coordinating groups of any kind should master before taking on that role.

Yalom, in collaboration with Lesz, synthesizes and integrates the latest scientific research with classic studies, creating an enjoyable and enlightening reading experience. He extensively discusses the core mechanisms necessary for therapeutic change to occur within a group. Additionally, he presents ways to address difficult group members and strategies for meeting key therapeutic goals.

His vivid language makes his deep clinical experience even more captivating.