Purnamasari, I., E. Nirwa, and M. Hindayani. “The Effect of Using Colored Sand Media on the Cognitive Abilities of Children Aged 5–6 Years at TK Negeri Pembina 1 Bengkulu City”. International Journal of Education, Information Technology, and Others, Vol. 9, no. 3, Aug. 2026, pp. 49-60, https://www.jurnal.peneliti.net/index.php/IJEIT/article/view/14261.