Siregar, Torang. “A Penerapan Model Pembelajaran Problem-Based Learning Untuk Meningkatkan Prestasi Belajar Matematika Siswa Di SMA Negeri 1 Sinunukan”. COMPETITIVE: Journal of Education 2, no. 2 (April 2, 2023): 94–102. Accessed October 18, 2024. https://competitive.pdfaii.org/index.php/i/article/view/9.