Saputra RE, Pasaribu M, Syamsu S. Analysis of Concept Understanding on Material Changes in Substance Forms by Using Three Tier Test Instruments for Students of SMA Negeri 1 Lore Utara. ME [Internet]. 2021Nov.3 [cited 2025Jul.30];17(2):126-30. Available from: https://jurnalfkipuntad.com/index.php/jme/article/view/1322