Nisa, E. K. and Wulandari, F. (2019) “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(1), pp. 195–202. doi: 10.21070/picecrs.v2i1.2387.