Della Rency Melia Indah, Kasmantoni, and Bustomi. “Implementation of Language Politness Principles in Indonesian Language Learning Discussion Activities ”. Jadila: Journal of Development and Innovation in Language and Literature Education 2, no. 4 (September 2, 2021): 392-405. Accessed December 7, 2021. https://ejournal.karinosseff.org/index.php/jadila/article/view/227.