AHMAD SOPIAN; H. AHMAD SYUKRI; H. KASFUL ANWAR. US. KYAI’S SPIRITUAL LEADERSHIP MODEL ON INCREASING PRODUCTIVITY OF ISLAMIC BOARDING SCHOOL EDUCATION IN SOUTH SUMATERA. European Journal of Humanities and Educational Advancements, [S. l.], v. 2, n. 10, p. 110-115, 2021. Disponível em: https://scholarzest.com/index.php/ejhea/article/view/1323. Acesso em: 9 jan. 2025.