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Some aspects of operations / Jean Piaget
Operational thought and social adaptation / Peter H. Wolff
Fundamental education / René A. Spitz
The enmity between generations and its probable ethological causes / Konrad Lorenz
Infants' play and cognitive development / Lois Barclay Murphy
Play and actuality / Erik H. Erikson.
Operational thought and social adaptation / Peter H. Wolff
Fundamental education / René A. Spitz
The enmity between generations and its probable ethological causes / Konrad Lorenz
Infants' play and cognitive development / Lois Barclay Murphy
Play and actuality / Erik H. Erikson.