1. On the plasticity of intelligence in adulthood and old age;Baltes;American Psychologist,1976
2. Games people play: The psychology of human relations;Berne,1964
3. Learning, remembering, and understanding;Brown,1983
4. Diagnosing zones of proximal development;Brown,1985
5. Vygotsky: A historical and conceptual perspective;Bruner,1985