P. Dumigsi, Myrell, and Jem B. Cabrella. “Effectiveness of Strategic Intervention Material in Mathematics As Remediation for Grade 9 Students in Solving Problems Involving Quadratic Functions”. Asian Journal of Education and Social Studies 5, no. 1 (August 27, 2019): 1-10. Accessed August 1, 2021. https://journalajess.com/index.php/AJESS/article/view/30137.