1. Ambrose, R., Baek, J., & Carpenter, T. (2003). Children's invention of multidigit multiplication and division algorithms. In A. Baroody & A. Dowker (Eds.), The development of arithmetic concepts and skills: constructive adaptive expertise (pp. 307–338). Mahwah: Lawrence Erlbaum Associates.
2. Australian Curriculum Assessment and Reporting Authority (ACARA) (2013) Australian curriculum: mathematics. Retrieved from: http://www.australiancurriculum.edu.au/ mathematics/curriculum/
3. Barnett, E., & Ding, M. (2019). Teaching of the associative property: a natural classroom investigation. Investigations in Mathematics Learning, 11(2), 148–166. https://doi.org/10.1080/19477503.2018.1425592.
4. Carpenter, T. P., Franke, M. L., & Levi, L. (2003). Thinking mathematically: integrating arithmetic & algebra in elementary school. Portsmouth: Heinemann.
5. Carpenter, T. P., Levi, L., Franke, M., & Zeringue, J. (2005). Algebra in elementary school: developing relational thinking. ZDM Mathematics Education, 37(1), 53–59.