Hadiatmi, Islamiyah, Sudirman Wilian, and Kamaludin Yusra. 2020. “Classroom Languages As Used By English Teachers At An Indonesian Junior High School In Smpn 1 Keruak”. Jurnal Ilmiah Pendidikan Indonesia 2 (1):81-90. https://jipi.unram.ac.id/index.php/jipi/article/view/40.