NURLAILY, V. A.; SOEGIYANTO, H.; USODO, B. Elementary school teacher’s obstacles in the implementation of problem-based learning model in mathematics learning. Journal on Mathematics Education, [S. l.], v. 10, n. 2, p. 229–238, 2019. Disponível em: https://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3790. Acesso em: 29 jul. 2025.