Wan Abdullah, W. S. (1995) “Konsep al-Illah wa al-Ma’lul Ikhwan al-Safa’: Satu Analisa Risalah Fi al-’Ilal wa Al-Ma’lulat”, Jurnal Usuluddin, 2, pp. 175–193. Available at: https://mjlis.um.edu.my/index.php/JUD/article/view/2957 (Accessed: 23 December 2024).