Sari, A. I. and Damri, D. (2023) “Improving the Ability of Subtraction Count Operations Using Abacus Media for Children with Mild Mental Disability: (Single Subject Research in SLB Perwari Padang)”, Edumaspul: Jurnal Pendidikan, 7(1). Available at: https://jurnal.unimen.cloud/index.php/maspuljr/article/view/5629 (Accessed: 6April2026).