Tandililing, P., Sirampun, E., Kho, R., & Ruamba, M. Y. (2025). Geometric Thinking Levels in Learning Quadrilaterals: A Van Hiele-Based Case Study in a Papuan Junior High School. Edumatica : Jurnal Pendidikan Matematika, 15(2), 124–136. https://doi.org/10.22437/edumatica.v15i2.43719