A. Isticharoh, Y. . Fauziah, and T. . Churrohman, “Principal Managerial System in Creating Quality Culture in SMP Muhammadiyah 3 Waru: Sistem Manajerial Kepala Sekolah dalam Menciptakan Budaya Mutu di SMP Muhammadiyah 3 Waru”, icecrs, vol. 5, Jun. 2020.