Barlow, A. T., Gerstenschlager, N. E., Strayer, J. F., Lischka, A. E., Stephens, D. C., Hartland, K. S., & Willingham, J. C. (2018). Scaffolding for Access to Productive Struggle. Mathematics Teaching in the Middle School, 23(4), 202-207. https://doi.org/10.5951/mathteacmiddscho.23.4.0202