Nisa, Erlita Khoirun, and Fitria Wulandari. “Pengaruh Model Problem Based Learning Terhadap Self-Confident Dan Hasil Belajar Siswa: The Effect of Problem Based Learning Model on Self-Confident and Student Learning Outcomes”. Proceedings of The ICECRS 2, no. 1 (October 30, 2019): 195–202. Accessed September 14, 2025. https://icecrs.umsida.ac.id/index.php/icecrs/article/view/1390.