J.J, Septi, and Relsas Yogica. “DEVELOPMENT OF INTEGRATED NATURAL SCIENCE ELECTRONIC CHAPTER BOOK WITH CONTEXTUAL APPROACH ON THE MATERIAL GLOBAL WARMING FOR CLASS VII SMP”. Universe 3, no. 1 (July 31, 2022): 28-33. Accessed February 5, 2025. http://universe.ppj.unp.ac.id/index.php/universe/article/view/141.