1. Agazarian, Y. M. (1989). Group-as-a-whole: Systems theory and practice.Group, 13(3), 131–154.
2. Bany, M. A., & Johnson, L. V. (1964).Classroom group behavior: Group dynamics in education. New York: Macmillan.
3. Berelson, B., & Steiner, G. A. (1964).Human behavior. New York: Brace & World.
4. Bion, W. R. (1959)Experiences in groups. London, England: Tavistock.
5. Bruder, I. (1989, January/February). Future teachers: Are they prepared?Electric Learning pp. 32–39.