Pitriani. PROBLEM BASED LEARNING BERBANTUAN CABRI 3D UNTUK MENINGKATKAN HABIT OF THINKING FLEXIBLY SISWA SMA. Nabla Dewantara : j.pendidik.matematika [Internet]. 2016 Nov. 7 [cited 2026 Jun. 12];1(2). Available from: https://staging-ejournal.unitaspalembang.ac.id/index.php/nabla/article/view/499