“MENINGKATKAN MOTIVASI BELAJAR MAHASISWA MELALUI PEMBELAJARAN MODEL PROBLEM SOLVING MATERI STOIKIOMETRI”. Lantanida Journal 5, no. 2 (March 15, 2018): 145–159. Accessed March 12, 2026. https://jurnal.ar-raniry.ac.id/index.php/lantanida/article/view/2836.