Tumiran, Tumiran, et al. “Implementasi Model Leadership Kepala Sekolah Dalam Peningkatan Kompetensi Guru Di Ar-Rahman Medan”. Innovative: Journal Of Social Science Research, vol. 3, no. 4, Sept. 2023, pp. 3625-34, http://j-innovative.org/index.php/Innovative/article/view/3952.