Özcan, Zeynep Çiğdem, and Handan Doğan. “A Longitudinal Study of Early Math Skills, Reading Comprehension and Mathematical Problem Solving”. Pegem Journal of Education and Instruction 8, no. 1 (November 17, 2017): 01–18. Accessed April 30, 2026. https://pegegog.net/index.php/pegegog/article/view/pegegog.2018.001.