Sarah Maulida, Siti, Sastrawan Banuharli, Saparwadi Saparwadi, Nursali Nursali, Sanuardi Sanuardi, Rita Kartika Murni, and Nuraini Nuraini. 2024. “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 (1):70-79. https://doi.org/10.61277/ije.v2i1.79.