1. Performance of retarded adolescents and nonretarded children on the Tower of Hanoi problem;Byrnes;American Journal of Mental Deficiency,1977
2. Developmental progression of the Tower of Hanoi problem;Byrnes;Bulletin of the Psychonomic Society,1979
3. Experimental design: Procedures for the behavioral sciences;Kirk,1968
4. Formal assessment of problem-solving and planning processes in preschool children;Klahr;Cognitive Psychology,1981
5. The grasp of consciousness;Piaget,1976