TANDILILING, Pitriana; SIRAMPUN, Elsi; KHO, Ronaldo; RUAMBA, Marthinus Yohanes. Geometric Thinking Levels in Learning Quadrilaterals: A Van Hiele-Based Case Study in a Papuan Junior High School. Edumatica : Jurnal Pendidikan Matematika, [S. l.], v. 15, n. 2, p. 124–136, 2025. DOI: 10.22437/edumatica.v15i2.43719. Disponível em: https://www.online-journal.unja.ac.id/edumatica/article/view/43719. Acesso em: 22 apr. 2026.