Tarigan, L. R. B. and Mangaratua Marianus Simanjorang (2023) “Improving Student Mathematics Learning Outcomes Through the Problem Based Learning (PBL) Learning Model on Linear Program Material in Class XI SMA Negeri 1 Tigabinanga”, Formosa Journal of Multidisciplinary Research, 2(1), pp. 163–176. doi: 10.55927/fjmr.v2i1.2694.