Utoyo, S., Ismaniar, I., Hazizah, N., Putri, E.A. and 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 (Jan. 2026), 308–324. DOI:https://doi.org/10.48161/qaj.v6n1a2176.