Rafidah, Humaimah Nakhlah, Fida Rachmadiarti, and Muji Sri Prastiwi. “Stepping Together With Nature of Malang Raya: The Development Environmental Changes E-Book Based on Problem Based Learning (PBL)”. Jurnal Penelitian Pendidikan IPA 10, no. 7 (July 25, 2024): 3556–3568. Accessed April 8, 2025. https://jppipa.unram.ac.id/index.php/jppipa/article/view/7377.