1. Bertalanffy, L. V. (1968).General System Theory: Foundations, Development, Applications George Braziller, New York.
2. Bertalanffy, L. V. (1975),Perspectives on General System Theory George Braziller, New York.
3. Blauberg, I. V., Sadovsky, V. N., and Yudin, E. G. (1977).Systems Theory: Philosophical and Methodological Problems Progress Publishers, Moscow.
4. Bruner, J. (1960).The Process of Education Harvard University Press, Cambridge, Massachusetts.
5. Bruner, J. (1991).Literacy: An Overview by Fourteen Experts Hill and Wang, New York.