ZHANG, L. Undergraduate German as a Second Foreign Language Learning Experience and Improvement Strategies . Science Insights Education Frontiers, [S. l.], v. 12, n. 2, p. 1719–1728, 2022. DOI: 10.15354/sief.22.or061. Disponível em: https://bonoi.org/index.php/sief/article/view/822. Acesso em: 17 apr. 2026.