Nur Arifah, M., Habibi, M. M., Dewantoro, M. H., Afifah Adawiyah, S., & Haningsih, S. (2022). Platform on Online Learning for Students with Mental Retardation. KnE Social Sciences, 7(10), 236-247. https://doi.org/10.18502/kss.v7i10.11362