JAMES, E.; MAMAT, N.; MOHD RADZI, N. M. binti. 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, [S. l.], v. 15, p. 117–133, 2022. DOI: 10.37134/bitara.vol15.sp.12.2022. Disponível em: https://ojs.upsi.edu.my/index.php/JPB/article/view/7173. Acesso em: 3 dec. 2022.