Nurnberger-Haag, J., J. McTeer, A. Hopkins, J. Ries, A. Catterall, H. Maxwell, and I. J. Branham. “Environmental Math in the Classroom: What Do Your Walls Say?”. Ohio Journal of School Mathematics, vol. 81, no. 1, Dec. 2018, https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/OJSM/article/view/6556.