Simatupang, Olly Yohana, Benjamin Simamora, and Debbi Petra Meyana Sitorus. 2023. “The Influence of the Problem Based Learning (PBL) Model on Learning Outcomes in Social Sciences Subjects ASEAN Class VIII UPTD SMP NEGERI 7 PEMATANG SIANTAR”. International Journal of Global Sustainable Research 1 (2):283-92. https://doi.org/10.59890/ijgsr.v1i2.657.