Hutagalung, Rotua. “Peranan Pendidikan Agama Kristen Bagi Pembinaan Anak Tunagrahita”. Integritas: Jurnal Teologi 1, no. 2 (January 17, 2020): 156-167. Accessed April 21, 2025. https://journal.sttjaffrayjakarta.ac.id/index.php/JI/article/view/15.