Syawaludin, M. Rusdi. “Pengembangan Perangkat Pembelajaran Matematika Berbasis Problem Based Learning (PBL) Pada Materi Integral Di Kelas X SMK”. Indonesian Research Journal on Education 4, no. 4 (October 18, 2024): 1405 –. Accessed October 24, 2026. https://irje.org/irje/article/view/514.