1. Constructs in psychology and psychological ecology;Lewin;University of Iowa Studies in Child Welfare,1944
2. Field Theory in Social Science;Lewin,1951
3. Big School, Small School;Barker,1964
4. Some thoughts on school size and its effects in adolescent development;Garbarino;Journal of Youth and Adolescence,1980
5. Ecological validity of social indicator data as predictors of survey findings;Kogan;Journal of Social Service Research,1977