Haryono, Akhmad, Bambang Wibisono, and Firman Maulana Fadlil. “The Use of Honorific in Islamic Boarding Schools As a Form of Maintaining a Culture of Courtesy”. International Journal of Social Sciences and Humanities Invention 9, no. 04 (April 19, 2022): 6952–6967. Accessed January 9, 2025. https://valleyinternational.net/index.php/theijsshi/article/view/3446.