Bada, Claudia Betruchy. “Identification of High School Students’ Thinking Process Levels in Solving Geometry Problems Using Van Hiele’s Theory”. Jurnal Amal Pendidikan 5, no. 1 (April 30, 2024): 123–130. Accessed September 29, 2024. https://japend.uho.ac.id/index.php/journal/article/view/118.