Van Lap, Nguyen. “ON TESTING FOR LINGUISTIC POLITENESS ANALYSIS IN VIETNAMESE”. VNUHCM Journal of Science and Technology Development 3, no. 7&8 (August 31, 2000): 100-106. Accessed June 1, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3587.