AGUSTINA, L.; SUDAHRI, S. Shifts in Eighth-Grade Students’ Mental Model Levels in Understanding Quadrilateral Concepts Through Group Discussion . Jurnal Pendidikan Terapan, [S. l.], v. 4, n. 2, p. 233–241, 2026. DOI: 10.61255/jupiter.v4i2.864. Disponível em: https://journal.diginus.id/JUPITER/article/view/864. Acesso em: 15 jun. 2026.