1. Cue-learning and problem-learning strategies in normal and retarded children;Achenbach;Child Development,1968
2. Effects of institutionalization on retarded children: A longitudinal, cross-institutional investigation;Balla;American Journal of Mental Deficiency,1974
3. Use of the opposition concept and outer-directedness in intellectually average, familial retarded, and organically retarded children;Balla;American Journal of Mental Deficiency,1971
4. Pre-institutional social deprivation, responses to social reinforcement and IQ changes in institutionalized retarded individuals: A six-year followup study;Balla;American Journal of Mental Deficiency,1975
5. Personality development in retarded persons;Balla,1979