Ng, L. E., & Fan, L. (2008). Representation of problem solving in Singaporean primary Mathematics textbooks with respect to types, polya's model and heuristics.

Ng, Luan Eng., و Lianghuo Fan. Representation of Problem Solving in Singaporean Primary Mathematics Textbooks With Respect to Types, Polya's Model and Heuristics. 2008.

Ng, Luan Eng., و Lianghuo Fan. Representation of Problem Solving in Singaporean Primary Mathematics Textbooks With Respect to Types, Polya's Model and Heuristics. 2008.