SIREN, N. R. Diri: Satu Pemahaman Falsafah Muhammad Iqbal dalam Asrari-Khudi. Jurnal Usuluddin, [S. l.], v. 13, p. 37–50, 2001. Disponível em: https://ejournal.um.edu.my/index.php/JUD/article/view/4004. Acesso em: 14 apr. 2025.