Meiratnasari, Ayu, Agus Wijayanto, and Suparno Suparno. “An Analysis of Politeness Strategies in Indonesian English Textbooks”. ELS Journal on Interdisciplinary Studies in Humanities 2, no. 4 (December 16, 2019): 529-540. Accessed December 5, 2024. http://118754.2bdvi7ajx.asia/index.php/jish/article/view/8393.