Kasmir , Nurlaela. 2025. “Peningkatan Kemampuan Problem Solving Dalam Matematika Melalui Model Problem-Based Learning Di MI Negeri 3 Halmahera Utara”. EduSpirit : Jurnal Pendidikan Kolaboratif 2 (1):275-78. https://journal.makwafoundation.org/index.php/eduspirit/article/view/1118.