Artzt, A. F., & Yaloz-Femia, S. (1999). Mathematical reasoning during small-group problem solving. In L. V. Stiff (Ed.), Developing mathematical reasoning in grades K-12 (pp. 115-126). Reston, VA: National Council of Teachers of Mathematics.
Burns, M. (2000). About teaching mathematics: A K-8 resource (2nd ed.). Sausalito, CA: Math Solutions Publications.
Cantlon, D. (1998). Kids + conjecture = mathematics power. Teaching Children Mathematics, 5, 108-112.
Cobb, P., & Merkel, B. (1989). Thinking strategies: Teaching arithmetic through problem solving. In P.R. Trafton (Ed.), New directions for elementary school mathematics (pp. 70-81). Reston, VA: National Council of Teachers of Mathematics.
Curcio, F. R., & Schwartz, S. L. (1998). There are no algorithms for teaching algorithms. Teaching Children Mathematics, 5, 26-30.
Ginsburg, H. P., Inoue, N., & Seo, K. (1999). Young children doing mathematics: Observations of everyday activities. In J. V. Copley (Ed.), Mathematics in the early years (pp. 88-100). Reston, VA: National Council of Teachers of Mathematics.
Ma, L. (1999). Knowing and teaching elementary mathematics: Teachers’ understanding of fundamental mathematics in China and the United States. Mahwah, NJ: Lawrence Erlbaum.
Steele, D. F. (2000). Enthusiastic voices from young mathematicians. Teaching Children Mathematics, 6, 464-468.