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 April 7, 2025.
https://journals.ku.edu/jmr/article/view/5677.