H. Lumbantobing, “The Effect of Interactive Computer Program on Student Accomplishment in Teaching Trigonometry”, IJSBAR, vol. 42, no. 3, pp. 38–48, Nov. 2018, Accessed: Sep. 18, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/9393