Nisa, Erlita Khoirun, and Fitria Wulandari. “Pengaruh Model Problem Based Learning Terhadap Self-Confident Dan Hasil Belajar Siswa”. Proceedings of The ICECRS 2, no. 1 (October 30, 2019): 195-202. Accessed May 18, 2024. https://icecrs.umsida.ac.id/index.php/icecrs/article/view/1390.