1.
Simatupang OY, Simamora B, Sitorus DPM. 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. IJGSR [Internet]. 2023 Nov. 27 [cited 2026 May 12];1(2):283-92. Available from: https://journal.multitechpublisher.com/index.php/ijgsr/article/view/657