Laski, Elida V., Marina Vasilyeva, and Joanna Schiffman. “Longitudinal Comparison of Montessori Versus Non-Montessori Students’ Place-Value and Arithmetic Knowledge”. Journal of Montessori Research 2, no. 1 (May 15, 2016): 1–15. Accessed November 22, 2024. https://journals.ku.edu/jmr/article/view/5677.