Al Ayyubi, I. I., Nurhikmah, Noerzanah, F., Prayetno, E. and Asri, M. R. (2025) “Math Puzzles and Free Play: Which is More Effective for Children’s Spatial Development?”, Indonesian Journal of Early Childhood: Jurnal Dunia Anak Usia Dini, 7(2), pp. 264–279. doi: 10.35473/ijec.v7i2.3932.