et. al., Rika Ningsih,. “Politeness in Language of Riau Malay Students: A Linguistic Phenomenon”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 13 (June 22, 2021): 5250–5258. Accessed September 12, 2025. https://textitlejournal.com/turcomat.org/index.php/turkbilmat/article/view/9715.