fadila, tesya dwina, and Yurnetti Yurnetti. “Development Of Integrated Science Teaching Materials Based On Problem Based Learning For Grade 8th Junior High School”. Universe 4, no. 2 (March 22, 2024): 203–212. Accessed April 18, 2026. http://universe.ppj.unp.ac.id/index.php/universe/article/view/626.