Yanti, Ifma, and Jon Efendi. “KEMAMPUAN MENGENAL NILAI MATA UANG MELALUI PERMAINAN ULAR TANGGA MODIFIKASI BAGI ANAK TUNAGRAHITA RINGAN”. Ranah Research : Journal of Multidisciplinary Research and Development 1, no. 4 (August 9, 2019): 921-990. Accessed May 5, 2024. https://jurnal.ranahresearch.com/index.php/R2J/article/view/160.