Dahliawaty, D., Z. Zulmiyetri, I. Irdamurni, and I. Utami. “Improving Learning of Addition Count Operation through Realistic Mathematics Education Approach for Mildly Retarded Children: Classroom Action Research VII SLB Autisma Mutiara Bangsa Pratama Padang”. Edumaspul: Jurnal Pendidikan, Vol. 7, no. 1, Mar. 2023, pp. 716-21, https://ummaspul.e-journal.id/maspuljr/article/view/5624.