Optimism and pessimism in teaching process. R&E-SOURCE, [S. l.], v. 1, n. 1, 2018. DOI: 10.53349/re-source.2018.i1.a628. Disponível em: https://journal.ph-noe.ac.at/index.php/resource/article/view/628. Acesso em: 10 oct. 2025.