Octaria, Dina, and Eka Fitri Puspasari. 2018. “Peningkatan Self-Efficacy Mahasiswa Melalui Problem Based Learning (PBL) Pada Mata Kuliah Program Linier”. Jurnal Elemen 4 (1):66-79. https://doi.org/10.29408/jel.v4i1.496.