Indriyani, Ratih, Taswadi, and Bandi Sobandi. “Analysis of Cognitive Development Theory by Jean Piaget on Color Games on Early Childhood Development”. EduLine: Journal of Education and Learning Innovation 4, no. 4 (October 10, 2024): 504–511. Accessed May 2, 2026. https://jurnal.ahmar.id/index.php/eduline/article/view/3068.