Carpenter, Thomas P., Megan Loef Franke, and Linda Levi,
Integrating Arithmetic and Algebra in Elementary School
(Portsmouth: Heinemann, 2003).
Kordemsky, Boris A.,
The Moscow Puzzles: 359 Mathematical Recreations
, Ed. Martin Gardner (New York: Dover Publications, 1972).
Teaching Problems and the Problems of Teaching
(New Haven: Yale University Press, 2001).
Knowing and Teaching Elementary Mathematics: Teachers’ Understanding
of Fundamental Mathematics in China and the United States
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Mathematical Puzzles of Sam Loyd,
Selected and Edited by Martin Gardner (New York: Dover Publications, 1959).
- textbook 6A, and 6B - Curriculum Planning and Development Division Ministry of Education, Singapore (Singapore: Times Media, 2003).