Batidor, Paulo G., and Leomarich F. Casinillo. “Evaluating Spiral Progression Approach (SPA) in Teaching Science and Mathematics for Junior High Curriculum”. Philippine Social Science Journal 4, no. 3 (October 25, 2021): 39-47. Accessed November 21, 2024. https://philssj.org/index.php/main/article/view/362.