Mustadi, Ali, Setiawan Edi Wibowo, and Octavian Muning Sayekti. “The Development of E-Modules for Language Politeness Learning in Independent Curriculum-Based Elementary School”. Jurnal Kependidikan : Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran, dan Pembelajaran 9, no. 2 (June 1, 2023): 408–420. Accessed October 13, 2025. https://e-journal3.undikma.ac.id/index.php/jurnalkependidikan/article/view/7366.