PHAM , T. M. T.; YEH, A. Politeness of Vietnamese Students in Writing Request Email in English: a Course-based and Socio-pragmatic Study . International Journal of Language and Literary Studies, [S. l.], v. 2, n. 2, p. 109–128, 2020. DOI: 10.36892/ijlls.v2i2.202. Disponível em: https://mail.ijlls.org/index.php/ijlls/article/view/202. Acesso em: 3 jul. 2024.