5Williams,F.E.(1972).A Total Creativity Program for Individualizing and Humanizing the Learning Process.Englewood Cliffs,NJ:Educational Technology Publications.
6Guilford,J.P.(1967).The nature of human intelligence.New York:McGraw-Hill.
7Sternberg,R.J.(1996).Successful Intelligence.New York:The Jeff Herman Literary Agency,Inc.
8Feuerstein,R.,Rand,Y.,Hoffman,M.& Miller,M.(1980).Instrumental enrichment:An intervention programme for cognitive modifiability.Baltimore,MD:University Park Press.
