8B J Fraser,K G Tobin(eds). International handbook of science education. Netherlands: Kluwer Academic Publishers, 1998: 3--25
9Lan Westbury, Stepan Hopmann. Teachig as a Reflective Practice-The German Didaktik Tradition. London.. Lawrence Erlhawn Associaites Publishers, 2000.. 319--333
10Duit R, Treagust D. International Journal of Science Education, 2003,25 (8) : 671--688
