S. E. Buan, C. P. Coronado, J. C. D. Jesus, R. D. Cruz, A. G. R. Marcial, and R. R. Sotto, “Effectiveness of Mathematics Drills on the Speed, Accuracy, and Automaticity of Multiplication Skills of Grade 4 Learners: Basis for Enhancement Program”, IJRIS, vol. 4, no. 10, pp. 33–51, Oct. 2026, doi: 10.65138/ijris.2026.v4i10.367.