DJIDU, Hasan; JAILANI, Jailani. Developing problem based calculus learning model. Jurnal Kependidikan: Penelitian Inovasi Pembelajaran, [S. l.], v. 2, n. 1, p. 68–84, 2018. DOI: 10.21831/jk.v2i1.12689. Disponível em: https://journal.uny.ac.id/index.php/jk/article/view/12689. Acesso em: 17 may. 2025.