RAHAYU, N. K. L. A.; AGUSTIKA, G. N. S. Improving Mathematics Learning Outcomes through Problem Based Instruction. International Journal of Elementary Education, [S. l.], v. 4, n. 3, p. 261–269, 2020. DOI: 10.23887/ijee.v4i3.25409. Disponível em: https://ejournal.undiksha.ac.id/index.php/IJEE/article/view/25409. Acesso em: 2 may. 2024.