Hikmah A, Manurung K, Dewi AK. Developing Speaking Skill of Grade XI Students of SMA Negeri 1 Ampibabo through Problem Solving Method. ELS-JISH [Internet]. 2021Dec.8 [cited 2024May2];4(4):413-2. Available from: https://journal.unhas.ac.id/index.php/jish/article/view/18480