8. Лавлагаа материал:
Bruner, J. (1966). Toward a theory of instruction. Cambridge, MA:
Belknap Press of Harvard University Press.
Herbert Ginsburg and Sylvia Opper (1979), Piaget's Theory of Intellectual
Development, Prentice Hall, ISBN 0-13-675140-7, p. 152.
Vygotsky, L. S. (1978). Mind in society: The development of higher
psychological processes. Cambridge, MA: Harvard University Press.
Piaget, J. (1928). La causalité chez l’enfant. British Journal of
Psychology, 18, 276-301