Khali, Zetty Khairunisa, and Roslinda Rosli. “Topic Analysis of Algebraic Expressions and Algebraic Formulae in Form 1 and Form 2 Mathematics Textbooks”. Jurnal Pendidikan Sains dan Matematik Malaysia 11, no. 2 (September 14, 2021): 26-38. Accessed October 3, 2022. https://ejournal.upsi.edu.my/index.php/JPSMM/article/view/5702.