1. Abdullah, N., Halim, L., & Zakaria, E. (2014). VStops: a thinking strategy and visual representation approach in mathematical word problem solving toward enhancing stem literacy. EURASIA Journal of Mathematics, Science & Technology Education, 10(3), 165-174.
2. Baharam, B. H., Baharam, B. H., Ahmad, N. J., Tahir, N. M., & Hanafiah, M. N. M. (2017). Matematik tingkatan 2.
3. Burris, A. C. (2005). Understanding the Math You Teach Content and Methods for Prekindergarten Through Grade 4.
4. Byers, W. (2007). How mathematicians think: using ambiguity, contradiction, and paradox to create mathematics.
5. Chan, Y. L., & Puteh, M. (2016). Matematik tahun 6 sekolah kebangsaan.