1. Cooper, L.: Co-therapy relationships in groups. Unpublished paper
2. Freud, S.: Instincts and their vicissitudes. In: Rieff, P. (Ed.), General Psychological Theory, Papers on Metapsychology. New York: Collier Books 1963
3. Miller, E. J., Rice, A. K.: Systems of organization. London: Tavistock Publications 1967
4. Rice, A. K.: Learning for leadership. London: Tavistock Publications 1965
5. Rioch, M. J.: Group relationsrationale and technique. Int. J. of Group Psychotherapy 20, 340?355 (1970)