Ramadhania, Deanti, Sudi Prayitno, Sri Subarinah, and Arjudin Arjudin. “Analysis of Mathematics Problem-Solving Ability on Plane Figure Subject Based on Van Hieles Theory at Junior High School”. Jurnal Pijar Mipa 17, no. 4 (July 31, 2022): 493–498. Accessed February 6, 2023. https://jurnalfkip.unram.ac.id/index.php/JPM/article/view/3413.