Colorful Box Media as a Cognitive Intervention: Enhancing Three-Seriation Classification Skills in Children Aged 4–5 Years. Journal of Early Childhood Education Research , [S. l.], v. 2, n. 1, p. 35–44, 2026. DOI: 10.58230/jecer.v2i1.564. Disponível em: https://ssed.or.id/jecer/article/view/564. Acesso em: 15 oct. 2026.