Rusmini, R., & Surya, E. (2017). The Effect of Contextual Learning Approach to Mathematical Connection Ability and Student Self-Confidence Grade Viii Smp Negeri 8 Medan. International Journal of Sciences: Basic and Applied Research (IJSBAR), 35(2), 249-262. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/7933