Utoyo, S., Ismaniar, I., Hazizah, N., Putri, E. A., & Sihombing, S. C. (2026). A Practical Study of the Use of AI-Based E-Book Guides to Improve Early Childhood Mathematics Skills. Qubahan Academic Journal, 6(1), 308–324. https://doi.org/10.48161/qaj.v6n1a2176