patmi patmi, sholikhakh RA, sina ibnu. Pengembangan Perangkat Pembelajaran Problem Based Learning Berbantuan Quipper School. Union J. Ilm. Pendidik. Mat. [Internet]. 2019 Dec. 5 [cited 2023 May 29];7(3):337-46. Available from: https://jurnal.ustjogja.ac.id/index.php/union/article/view/5276