Ajismanto, Ajismanto, and Yarmis Hasan. 2019. “Improving the Ability to Recognize Primary Color Using Plastisifor Children Tunagrahita Light Class III in SLB Luki Padang”. EDUCATIO : Journal of Education 4 (2), 162-67. https://ejournal.staimnglawak.ac.id/index.php/educatio/article/view/181.