(8) Piaget 1953.Piaget, J. The Origin of Intelligence in the Child. London: Routledge and Kegan Paul.

  Kelly 1955.Kelly, G. The Psychology of Personal Constructs. New York: Norton.

  Harvey 1955.Harvey, O, Hunt, D and Schroder, H. Conceptual Systems and Personality Organisation. New York: John Wiley.

  Burns 1992.Burns, Barbara.(Editor). Advances in Psychology 93. Percepts, concepts and categories. Holland: Elsevier.

 


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