Zeynep Erşen, Fatih Karakuş. “Evaluation of Preservice Elementary Teachers’ Concept Images for Quadrilaterals”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 4, no. 2 (November 26, 2013): 124–146. Accessed September 12, 2025. https://textitlejournal.com/turcomat.org/index.php/turkbilmat/article/view/54.