1Ng, S. F. , g> Lee, K. (2009). The model meth- od: singapore children's tool for represehting and solving algebraic word problems. Journal for Research in Mathematics Education, 40 ( 3 ), 282-313.
2Ng, S. F. , Lee, K. , Ang, S. Y. , g> Khng, F. (2006). Model method.. Obstacle or bridge to learning symbolic algebra. In W. D. Bokhorst- Heng, M. D. Osborne K. Lee (Eds.), Re- designing pedagogy : Reflections on theory and pra.ris (pp. 227-242). Rotterdam, The Nether- lands: Sense Publishers.
3Ng, S. F. , Lee, K. (2009a). Model Method: A visual tool to support algebra word problemsolving at the primary level. In K. Y. Wong, P. Y. Lee, B. Kaur, P. Y. Foong S. F. Ng (Eds.), Mathematics Education : The singapore Journey (pp. 169-203). singapore: World Sci entific.
4Cai, J. F. , Moyer, J. (2008). Developing al- gebraic thinking in earlier grades= Some insights from international comparative studies. In C. E. Greenes & R. Rubenstein (Eds.), Algebra and algebraic thinkiig in school mathematics (pp. 169 - 180). Reston, VA.. NCTM, Inc.
5Lioe, L. T. (2009a). Challenges in reasoning quantitatively and ways of overcoming them in pair zoork : Cases of primary five and secondary one students. Unpublished Master Dissertation, Nanyang Technological University, singapore.
6Channel NewsAsia. (2009). US educators to a- dopt Singapore's method of teaching math (May 6). Retrieved Dec 18, 2009, from http//www. channelnewsasia, com/stories/singaporelocal- newsview4274021/, html.
