TY  - BOOK
AU  - Perry, Patricia
AU  - Pasnak, Robert
AU  - Holt, Robert W.
TI  - Instruction on concrete operations for children who are mildly mentally retarded
KW  - EFICACIA DE LA ENSE\197ANZA
KW  - ENSE\197ANZA INDIVIDUALIZADA
KW  - RETRASO MENTAL MODERADO
KW  - TEORIA PIAGETIANA
N1  - Mayo 1993
ER  -