1. Andel, P. van, Erdman, A.M., Karsdorp, P., Appels, A., & Trijsburg, R.W. (2003). Group cohesion and working alliance: prediction of treatment outcome in cardiac patients receiving cognitive behavioral group psychotherapy. Psychotherapy and Psychosomatics, 72, 141-149.
2. Bednar, R.L., & Kaul, T. (1978). Experiental group research: Current perspectives. In S.L. Garfield & A.E. Bergin (Eds.). Handbook of psychotherapy and behaviour change (2nd ed., pp. 769-815 New York: Wiley & Sons.
3. Bednar, R.L., & Kaul, T. (1994). Experiential group research. In A.E. Bergin & S.L. Garfield (Eds.) Handbook of psychotherapy and behaviour change (4th ed., pp. 631-664). New York: Wiley & Sons.
4. Bloch, S., & Crouch, E. (1985). Therapeutic factors in group psychotherapy. Oxford: Oxford University Press.
5. Braaten, L.J. (1990). The different patterns of group climate, critical incidents in high and low cohesion in sessions of group psychotherapy. International Journal of Group Psychotherapy, 40, 477-493.