|
Keil, F. C. (1979). Semantic and conceptual development. Cambridge, MA: Harvard University Press.
Kreitler, H. & Kreitler, S. (1976). Cognitive orientation and behavior.. NY: Springer.
Perry, W. G., Jr. (1970). Forms of intellectual and ethical development in the college years: A scheme.. New York: Holt, Rinehart, & Winston.
Piaget, J. (1955). The language and thought of the child. NY: Meridian Books.
Vygotsky, L. S. (1978). (Edited by Cole, M., John-Steiner, V., Scriber, S., and Souberman, E.) Mind in society: The development of higher psychological processes.. Cambridge, MA: Harvard University Press.
