Dwi Novita, Ria, Tien Aminatun, dan Rihab Wit Daryono. “E-Modules Through Flipped Classroom and PBL Models on Environmental Pollution Material to Increase Problem-Solving Ability”. Journal of Education Technology 6, no. 4 (Desember 14, 2022): 744–754. Diakses Juli 17, 2024. https://ejournal.undiksha.ac.id/index.php/JET/article/view/51656.