Sarah Maulida, Siti, Sastrawan Banuharli, Saparwadi Saparwadi, Nursali Nursali, Sanuardi Sanuardi, Rita Kartika Murni, and Nuraini Nuraini. “Optimizing Problem-Solving Skills in First Grade: A Project-Based Learning Model Enhanced by Lesson Study at Sekolah Dasar Unggulan Hamzanwadi”. IJE : Interdisciplinary Journal of Education 2, no. 1 (March 30, 2024): 70–79. Accessed November 7, 2025. https://skillerindonesia.id/index.php/ije/article/view/79.