4A Schoenfeld. What Is All the Fuss About Problem Solving [A]. A Schoenfeld, Lawrence Erlbaum. Cognitive Science and Mathematics Education [C]. 1987. 189-215.
5T Romberg. Problematic Features of the School Mathematics Curriculum [A]. Jackson, Macmillan. Handbook of Research on Curriculum: A Project of the American Educational Research Association [C]. 1992. 750.
