Happy Lumbantobing (2025) “Students’ Abilities and Activities Learning in Mathematics at Junior High School: The Discovery Learning Model Using a Scientific Approach”, International Journal of Sciences: Basic and Applied Research (IJSBAR), 77(1), pp. 38–49. Available at: https://gssrr.org/JournalOfBasicAndApplied/article/view/17463 (Accessed: 7 November 2025).