THE EFFECTIVENESS OF VIDEO-ASSISTED PROBLEM-BASED LEARNING MODEL ON STUDENTS’ SCIENCE LITERACY SKILLS OF VIBRATION AND WAVE MATERIAL IN SMP NEGERI 27 MEDAN. universe [Internet]. 2024 Sep. 17 [cited 2026 Oct. 18];5(1):134-49. Available from: https://universe.ppj.unp.ac.id/index.php/universe/article/view/925