DUONG, Huy Can. Observation method used in teaching Nature and Society subjects of grade 1,2,3. Dong Thap University Journal of Science, [S. l.], v. 10, n. 4, p. 11–16, 2021. DOI: 10.52714/dthu.10.4.2021.877. Disponível em: https://dthujs.vn/index.php/dthujs/article/view/273. Acesso em: 20 may. 2024.