J. C. Javier, K. Boncales, J. J. Gelladula, B. Linatoc, and J. R. Sarmiento, “The Cooperative Learning Strategies and Their Relationship to the Mathematics Engagement of Grade 9 Students at San Isidro National High School”, IJROMS, vol. 1, no. 6, pp. 142–157, Aug. 2026.