“ The Effects of Dynamic Geometry Software and Physical Manipulatives on Pre-Service Primary Teachers’ Van Hiele Levels and Spatial Abilities ”, TURCOMAT, vol. 6, no. 3, pp. 338–365, Dec. 2015, Accessed: May 30, 2026. [Online]. Available: https://www.turcomat.org/index.php/turkbilmat/article/view/92