Nst MM, Motlan M, Siregar AM. THE DIFFERENCE PROBLEM SOLVING SKILLS OF PHYSICS WHO ARE TAUGHT USING THE PROJECT BASED LEARNING MODEL WITH PROBLEM BASED LEARNING. JPF Unimed [Internet]. 2020 Dec. 31 [cited 2025 Jul. 2];9(2):68-72. Available from: https://jurnal.unimed.ac.id/2012/index.php/jpf/article/view/14061