Nasruddin, and Markus Palobo. “THE EFFECT OF THE APOS-BASED LEARNING FOR SELF-CONFIDENCE AND MATHEMATICS LEARNING ACHIEVEMENT”. International Journal of Research -GRANTHAALAYAH 11, no. 3 (April 5, 2023): 79–86. Accessed June 15, 2024. https://www.granthaalayahpublication.org/journals/granthaalayah/article/view/5075.