RACHMI, S. F.; SANTOSO, A. MENINGKATKAN KEMAMPUAN BERHITUNG PENJUMLAHAN BAGI ANAK TUNAGRAHITA SEDANG KELAS 2 MELALUI MEDIA POWERPOINT. SPEED Journal : Journal of Special Education, [S. l.], v. 1, n. 1, p. 17–22, 2018. Disponível em: https://jurnal.unipar.ac.id/index.php/speed/article/view/16. Acesso em: 15 mar. 2025.