Nasution, Wahyudin Nur. “The Effectiveness of Teachers’ Performance of Islamic Junior High School in Islamic Boarding School Langkat District, Indonesia”. Jurnal Ilmiah Peuradeun 6, no. 2 (May 28, 2018): 325–338. Accessed April 28, 2026. https://journal.scadindependent.org/index.php/jipeuradeun/article/view/285.