Efriza, Esi, and Zulmiyetri Zulmiyetri. 2019. “Improving Vocational Ability To Grow Hydroponics Through Direct Learning Models For Children With Light Mental Retardation”. EDUCATIO : Journal of Education 4 (2), 184-91. http://ejournal.staimnglawak.ac.id/index.php/educatio/article/view/184.