James, E., Mamat, N. and Mohd Radzi, N.M. binti (2022) “Implementation of ‘Spindle Box’ Activity in Improving the Understanding of Additional Operations for 4 Year Old Children: Pelaksanaan aktiviti ‘Spindle Box’ dalam Meningkatkan Kefahaman Operasi Tambah Terhadap Kanak-kanak 4 Tahun”, Jurnal Pendidikan Bitara UPSI, 15, pp. 117–133. doi:10.37134/bitara.vol15.sp.12.2022.