3Chavez, A.B. & Cardenas, C.D. ( 1990). What constructivism implies for teaching. In B.B.Davis, C.A. Maher, & N. Noddings (Eds.), Constructivist views on the teaching and learning of mathematics, Beston, VA:Nation Council of Teachersof Mathematics. P. 107.
4Bloom, B.S.An(1976). Introduction to Mastery Learning Theory. In J. H. Block(ed.). School, Society and Mastery Learning. New York : Holt, Rinehart & Winston. P. 11.
5Gable, R.K. ( 1989). Instrument Development in The Affective Domain. Kiuncer. Nijhoff Publishing. P2.