Nyaing. Efforts to Improve the Ability to Understand the Extent of Trapezium and Kites in Mathematics for Class V Students at SD Negeri I Dadahup Academic Year 2017/2018 . JPN [Internet]. 21 Januari 2021 [dikutip 26 April 2025];21(2):127-38. Tersedia pada: https://e-journal.upr.ac.id/index.php/JPN/article/view/2026