Yusuf, Mursidin. “The Importance of Principal Leadership in Creating A Culture of Teacher Professionalism in Indonesian Primary Schools”. El-Idarah: Jurnal Manajemen Pendidikan Islam, vol. 10, no. 1, Juli 2024, hlm. 1-10, https://journal.inass.ac.id/index.php/el-idarah/article/view/512.