Morkle, Chris Eric, and Clement Ayarebilla Ali. “APOS Framework Didactize Equivalence Linear Simultaneous Equations in Senior High School Mathematics”. Journal of Research in Mathematics, Science, and Technology Education 1, no. 2 (October 22, 2024): 84–100. Accessed November 24, 2024. https://spm-online.com/jrmste/index.php/journal/article/view/13.