Saripah, I., I. Tabroni, Y. Wang, and G. Zou. “Number Board Media to Stimulate the Symbolic Thinking Ability of Children Aged 5-6 Years”. Journal of Computer Science Advancements, vol. 1, no. 2, Aug. 2023, pp. 103-12, doi:10.55849/jsca.v1i2.456.