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 December 3, 2024. https://www.turcomat.org/index.php/turkbilmat/article/view/9715.