Sia, Soon Ping, and Kamariah Abu Bakar. “Improving the Addition of Preschool Children Through the Use of Concrete and Visual Materials: Meningkatkan Kemahiran Operasi Tambah Kanak-Kanak Prasekolah Melalui Penggunaan Bahan Konkrit Dan Visual”. Jurnal Pendidikan Awal Kanak-kanak Kebangsaan 11 (August 9, 2022): 103–113. Accessed March 29, 2024. https://ejournal.upsi.edu.my/index.php/JPAK/article/view/7156.