Kieran, C., Pang, J., Schifter, D., & Ng, S. F. (2016). Early Algebra: Research into its Nature, its Learning, its Teaching. Springer International Publishing : Imprint: Springer. https://doi.org/10.1007/978-3-319-32258-2

Kieran, Carolyn, JeongSuk Pang, Deborah Schifter, and Swee Fong Ng. Early Algebra: Research into Its Nature, Its Learning, Its Teaching. Cham: Springer International Publishing : Imprint: Springer, 2016. https://doi.org/10.1007/978-3-319-32258-2.

Kieran, Carolyn, et al. Early Algebra: Research into Its Nature, Its Learning, Its Teaching. Springer International Publishing : Imprint: Springer, 2016. https://doi.org/10.1007/978-3-319-32258-2.