Mardiah, Ainal, M. Ikhsan, and Marwan Marwan. 2019. “Improving Students’ Mathematical Reasoning Ability Through Problem Posing Approaches at SMPN 19 Banda Aceh”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 44 (2):26-36. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9790.