Ryesmi, Diah Sita, Dihliza Basya, and Ika Desy Wardani. 2022. “The Importance of Politeness Utterancess Used by Teachers and Students in Classroom Interaction”. Linguapedia 6 (2):34-44. https://ejurnal.uij.ac.id/index.php/LIN/article/view/2232.