Oliva, Rochelle Ebilane. “THE EFFECTIVENESS OF THE SPIRAL PROGRESSION APPROACH IN TEACHING JUNIOR HIGH SCHOOL MATHEMATICS IN ZAMBALES, PHILIPPINES”. Journal of Education and Innovation 25, no. 4 (August 24, 2023): 91–101. accessed October 7, 2026. https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/256468.