AHMAD, Muhammad Yusuf; SIREGAR, Balo. Guru Profesional Menurut Imam Al-Ghazali dan Buya Hamka. Al-Hikmah: Jurnal Agama dan Ilmu Pengetahuan, [S.l.], v. 12, n. 1, p. 21-45, apr. 2015. ISSN 2598-2168. Available at: <https://journal.uir.ac.id/index.php/alhikmah/article/view/1446>. Date accessed: 12 dec. 2019. doi: https://doi.org/10.25299/jaip.2015.vol12(1).1446.