Lütfi İncikabı, Abdullah Biber, Mujdat Takıcak, Semiha Bayam. “An Investigation of Seventh Grade Students’ Performances on Conceptual, Procedural and Graphical Problems Regarding Circles”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 6, no. 1 (April 7, 2015): 01–17. Accessed November 22, 2024. https://turcomat.org/index.php/turkbilmat/article/view/76.