Buka, S. P. Y., B. Costa, P. Silva, and S. Fallah. “The Role of Play in Early Childhood Education for Developing Creative Problem-Solving Skills: A Longitudinal Study”. Journal of Loomingulisus Ja Innovatsioon, vol. 2, no. 5, Dec. 2025, pp. 278-90, doi:10.70177/innovatsioon.v2i5.2579.