Destiana br Panjaitan, Tumpal Manahara Siahaan, and Anton Luvi Siahaan. “The Impact of Problem Based Learning Model for the Result of Social Subject Grade VIII in SMP Cinta Rakyat 3 Pematang Siantar Year 2022/2023”. International Journal of Integrated Science and Technology 1, no. 5 (November 29, 2023): 803–816. Accessed April 21, 2026. http://journal.multitechpublisher.com/index.php/ijist/article/view/781.