1. Psychological Ecology and the Problem of Psychological Development;Barker;Child Development,Sept. 1949
2. A Mathematical Model for Group Structures;Bavelas;Applied Anthropology,1948
3. Therapeutic Influence of the Group on the Individual;Bettelheim;American Journal of Orthopsychiatry,Oct. 1947
4. Experiences in Groups I and II;Bion;Human Relations,1948