Utoyo, Setiyo, Ismaniar Ismaniar, Nur Hazizah, Elsy Assari Putri, and Sri Cahaya Sihombing. 2026. “A Practical Study of the Use of AI-Based E-Book Guides to Improve Early Childhood Mathematics Skills”. Qubahan Academic Journal 6 (1):308-24. https://doi.org/10.48161/qaj.v6n1a2176.