Yacob, R., and R. Rosli. “Comparison of the Cognitive Level of the Topic Of Mixed Operations in Mathematics Year 5 Primary Schools in Malaysia and Brunei: Perbandingan Aras Kognitif Topik Operasi Bercampur Matematik Tahun 5 Sekolah Rendah Malaysia Dan Brunei”. Jurnal Pendidikan Sains Dan Matematik Malaysia, vol. 13, no. 1, May 2023, pp. 79-98, doi:10.37134/jpsmm.vol13.1.7.2023.