LE, H. H. POLITENESS STRATEGIES IN THE CONVERSATIONAL ACTIVITIES IN THE COURSE BOOK “CAMPAIGN 2”. VNU Journal of Foreign Studies, [S. l.], v. 39, n. 4, p. 1-15, 2022. Disponível em: https://jfs.ulis.vnu.edu.vn/index.php/fs/article/view/5152. Acesso em: 6 dec. 2023.