1. Adu-Gyamfi, K., Bossé, M. J., & Chandler, K. (2017). Student connections between algebraic and graphical polynomial representations in the context of a polynomial relation. International Journal of Science and Mathematics Education, 15(5), 915-938.
2. Aguilar, S., & Barroso, J. M. (2015). La triangulación de datos como estrategia en investigación educativa [Data triangulation as an strategy for educational research]. Pixel-bit, 47, 73-88.
3. Askew, M., Brown, M., Rhodes, V., Johnson, D., & Wiliam, D. (1997). Effective teachers of numeracy. Kings College, London.
4. Barmby, P., Harries, T., Higgins, S., & Suggate, J. (2009). The array representation and primary children’s understanding and reasoning in multiplication. Educational Studies in Mathematics, 70(3), 217-241.
5. Bryman, A. (2004). Social Research Methods. Oxford, New York