Derniati, Riza, Nahor Hutapea, and Elfis Suanto. “Pengembangan Perangkat Pembelajaran Pada Materi Transformasi Berbasis Problem Based Learning”. Jurnal Cendekia : Jurnal Pendidikan Matematika 6, no. 2 (July 26, 2022): 214402159. Accessed May 9, 2026. https://www.j-cup.org/index.php/cendekia/article/view/1428.