Saari, C. Z. (1998). Al-Ghazalis Views on the Heart, the Spirit and the Soul: A Comparison Between Ihya’ ’Ulum Al-Din and Al-Risalah Al-Laduniyyah. Jurnal Usuluddin, 7, 193–208. Retrieved from http://mojes.um.edu.my/index.php/JUD/article/view/3301