1. Common and specific factors in cognitive therapy;Arnkoff,1983
2. Individual psychotherapy and behavior therapy;Bergin;Annual Review of Psychology,1975
3. Research on therapist variables in psychotherapy;Beutler,1986
4. Helping and human relations: Practice and research;Carkhuff,1969
5. Crits-Christoph, P., Luborsky, L., McMellan, A.T., Woody, G., Pipper, W., Lieberman, B., & Imber, S. (in press). Do psychotherapists vary much in their success? The answer within four outcome studies.