1. Bateson, G. T. (1972). The logical categories of learning and communication. InSteps to an ecology of mind. London: Chandler.
2. Bion, W. R. (1961).Experiences in groups. London: Tavistock.
3. Bloch, S., & Crouch, E. (1985).Therapeutic factors in group psychotherapy. New York: International Universities press.
4. Boszormenyi-Nagy, I., & Kasneer, B. R. (1968).Between give and take: A clinical guide to contextual therapy. New York: Brunner-Mazel.
5. Cohn, B. R. (1980). Keeping the group alive.International Journal of Group Psychotherapy.38, 319?335.