C. C. Meng and N. Idris, “Assessment of Pre-Service Secondary Mathematics Teachers’ Van Hiele Levels of Geometric Thinking”, AJATeL, vol. 2, pp. 60–74, Dec. 2012, Accessed: Feb. 02, 2026. [Online]. Available: https://ejournal.upsi.edu.my/index.php/AJATeL/article/view/1924