Role of The Head of School In The Formation of Islamic-Based School Culture (Case Studi in SMP Muhammadiyah 30 Sihepeng Kab. Mandailing Natal). JPHR. 2025;1(1). Accessed March 4, 2026. http://journal-rumbio.willyprint-art.my.id/index.php/ojs/article/view/16