Pham , Thi Minh Trang, and Aiden Yeh. “Politeness of Vietnamese Students in Writing Request Email in English: A Course-Based and Socio-Pragmatic Study”. International Journal of Language and Literary Studies 2, no. 2 (June 8, 2020): 109–128. Accessed November 28, 2024. https://ijlls.org/index.php/ijlls/article/view/202.