1. Bandura, A. (1977).Social Learning Theory (Prentice-Hall, Englewood Cliffs, New Jersey).
2. Briars, D., and Siegler, R. S. (1984). A featural analysis of preschoolers' counting knowledge.Developmental Psychology, 20, 607?618.
3. Bruner, J. S., and Greenfield, P. M. (1969). Culture and cognitive growth. In Goslin, D. A., (ed.),Handbook of Socialization Theory and Research (Rand McNally, Chicago), pp. 633?657.
4. Donaldson, M. (1978).Children's Minds (Fontana, London).
5. Elbers, E. (1987). Interaction and instruction in the conservation experiment.European Journal of Psychology of Education 1: 77?89.