patmi, patmi, Rizqi Amaliyakh sholikhakh, and ibnu sina. “Pengembangan Perangkat Pembelajaran Problem Based Learning Berbantuan Quipper School”. Union : Jurnal Ilmiah Pendidikan Matematika 7, no. 3 (December 5, 2019): 337–346. Accessed February 1, 2023. https://jurnal.ustjogja.ac.id/index.php/union/article/view/5276.