Gufron, Emil, Amalia Santosa, and Agus Kadarmanto. “PENINGKATAN IMPLEMENTASI MODEL PROBLEM BASED LEARNING UNTUK MENINGKATKAN HIGHER ORDER THINKING SKILLS (HOTS) SISWA DI BONDOWOSO (Studi Kasus MAS Miftahul Ulum Pancoran)”. SIGMA : JURNAL PENDIDIKAN MATEMATIKA DAN SAINS 3, no. 1 (February 8, 2025): 26–35. Accessed February 15, 2026. https://journal.unibo.ac.id/index.php/sigma/article/view/1076.