8Linda Dacey & Drew Polly. CCSSM: The Big Picture. Teaching Children Mathematics, Vol. 18, No. 6: 378-383.
9Christine Keitel and Jeremy Kilpatrick. The Rationality and Irrationality of International Comparative Studies. In: Gabriele Kaiser Eduardo Luna and fan Huntley (ed.) International Comparisons in Mathematics Education. Falmer Press. 1999:241.
10NGA. CCSSO. Common Core State Standards for Nathematics[EB/OL].http://corestandards. org/the standards/mathematics, 1 93. 2010-03- 06.
