Laila, Nur Azmi, and Sugirin Sugirin. “Politeness Principles in Written Conversations: An Analysis of English Textbook”. AL-ISHLAH: Jurnal Pendidikan 14, no. 1 (March 30, 2022): 359–366. Accessed October 13, 2026. https://www.alishlah.ahfpublishing.id/alishlah/article/view/484.