Sfard, A., Gravemeijer, K., & Yackel, E. (2011). A Journey in Mathematics Education Research: Insights from the Work of Paul Cobb. Springer Netherlands. https://doi.org/10.1007/978-90-481-9729-3

Sfard, Anna, Koeno Gravemeijer, and Erna Yackel. A Journey in Mathematics Education Research: Insights from the Work of Paul Cobb. Dordrecht: Springer Netherlands, 2011. https://doi.org/10.1007/978-90-481-9729-3.

Sfard, Anna, et al. A Journey in Mathematics Education Research: Insights from the Work of Paul Cobb. Springer Netherlands, 2011. https://doi.org/10.1007/978-90-481-9729-3.