References

1) Piaget, J. (1953). How children form mathematical concepts. Scientific American, 189(5), 74–79.

2) Vygotsky, L. S. (1962). Language and thought. Massachusetts Institute of Technology Press, Ontario, Canada.

3) Wood, D., Bruner, J. S., & Ross, G. (1976). The role of tutoring in problem solving. Journal of Child Psychology and Psychiatry, 17(2), 89–100.