SIA, S. P.; ABU BAKAR, K. 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, [S. l.], v. 11, p. 103–113, 2022. DOI: 10.37134/jpak.vol11.sp.9.2022. Disponível em: https://ejournal.upsi.edu.my/index.php/JPAK/article/view/7156. Acesso em: 26 nov. 2022.