Dzulfiqar M, Bektiningsih K. MarBel Math: Android-Based Electronic Mathematics Book to Enhance Learning Outcomes for Fourth-Grade Students . International j.of Elementary Education [Internet]. 2024 Jun. 28 [cited 2025 Apr. 4];8(2):304-13. Available from: https://ejournal.undiksha.ac.id./index.php/IJEE/article/view/77263