Abdul Razak Othman, Daud Zakaria, & Abdullah Md. Isa. (2004). Mathematics Year 2: Activity book. Kuala Lumpur: Arus Intelek Sdn. Bhd.

Clarke, P. (2002). Maths spotlight activity sheets 1. Oxford, U.K: Heinemann Educational Publishers.

Gelman, R., & Gallistel, C. R.(1978). The child’s understanding of number. Cambridge, MA: Harvard University Press.

Hatfield, M. H., Edwards, N. T., & Bitter, G. G.(1993). Mathematics methods for the elementary and middle school. Needham Heights, MA: Allyn & Bacon. 

Heward, W. (2003). Exceptional children: An introduction to special education. Upper Saddle River, NJ: Prentice Hall. 

Holmes, E. E.(1985). Children learning mathematics – a cognitive approach to teaching. New Jersey, Eaglewood Cliffs: Prentice-Hall. 

Kennedy, L. M., & Tipps, S. (2000). Guiding children’s learning of mathematics. USA: Allyn &Wadsworth. 

Liew, M. L.(2008). Multitest question bank 1000: Mathematics KBSR Year 2. Subang Jaya: Pan Asia Publications Sdn. Bhd.  

Liew S. T., & Cham J. E.(2003). Mathematics textbook Year 2, part 1. Kuala Lumpur: YPJ Publications & Distributions Sdn Bhd. 

Liew S. T., & Cham J. E.(2003). Mathematics textbook Year 2, part 2. Kuala Lumpur: YPJ Publications & Distributions Sdn Bhd. 

Ministry of Education Malaysia. (2003). Integrated curriculum for primary schools curriculum specifications Mathematics Year 2.Kuala Lumpur:Curriculum Development Centre. 

Ng, S. F.(2002). Mathematics in action workbook 2B (Part 1). Singapore: Pearson Education Asia Pte.Ltd. 

Rucker, W. E., & Dilley, C. A.(1981). Heath mathematics. USA: D. C. Heath and Company. 

Toh, A. (2007). Resos pembelajaran masteri: Mathematics Year 3. Petaling Jaya:Pearson Malaysia Sdn. Bhd. 

Yee, S., & Ng, K. H.(2007). A problem solving approach: Mathematics Year Subang Jaya: Andaman Publication Sdn. Bhd.