THE ACQUISITION OF CONSERVATION OF SUBSTANCE AND WEIGHT IN CHILDREN: II.External reinforcement of conservation of weight and of the operations of addition and subtraction
Jan SmedslundVolume:
2
Année:
1961
Langue:
english
Pages:
14
DOI:
10.1111/j.1467-9450.1961.tb01223.x
Fichier:
PDF, 817 KB
english, 1961