Febriska, Inelia, Rahma Wati, and Renni Ramadhani Lubis. “Development of E-Books in Natural Science (IPA) Lessons Based on Discovery Learning for High Class Students in Primary Schools”. International Journal of Students Education 1, no. 2 (January 31, 2024): 623–628. Accessed August 3, 2025. https://journal.berpusi.co.id/index.php/IJoSE/article/view/554.