Rahmat, Cut Morina Zubainur, and Marwan. 2020. “Students’ Mathematical Problem Solving Abilities Through Realistic Mathematics Educational Approach in Elementary Schools”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 54 (1):138-45. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9766.