HOYI, R.; ASTALINI, A.; KURNIAWAN, D. A. Efforts to Improve Students’ Attitudes with the Problem Based Learning Model. Indonesian Journal of Educational Research and Review, [S. l.], v. 4, n. 1, p. 133–142, 2021. DOI: 10.23887/ijerr.v4i1.36751. Disponível em: https://ejournal.undiksha.ac.id/index.php/IJERR/article/view/36751. Acesso em: 27 dec. 2024.