A brief introductions to piaget: the growth of understanding in the young child-new light on children's ideas of number/
Isaacs,Nathan
- New York: Scocken Books 1974
620 Child Development
0-8052-0456-3
Child Development Mental Processes and intelligence|The Piagetian picture of child's development|The Concept of number|Piaget and his work as a whole|Piaget on number|The Experiments on number