PATMI, patmi; SHOLIKHAKH, R. A.; SINA, ibnu. Pengembangan Perangkat Pembelajaran Problem Based Learning Berbantuan Quipper School. Union : Jurnal Ilmiah Pendidikan Matematika, [S. l.], v. 7, n. 3, p. 337–346, 2019. DOI: 10.30738/union.v7i3.5276. Disponível em: https://jurnal.ustjogja.ac.id/index.php/union/article/view/5276. Acesso em: 1 feb. 2023.