POLITENESS IN FOREIGN LANGUAGE TEACHING AND LEARNING. Journal of Foreign Language Studies, [S. l.], n. 67, p. 3–16, 2021. DOI: 10.56844/tckhnn.67.85. Disponível em: http://journals.hanu.edu.vn/index.php/tckhnn/article/view/85. Acesso em: 15 jan. 2026.