Ibn al-Jawzī, Abū al-Faraj ʻAbd al-Raḥmān ibn ʻAlī, approximately 1116-1201 ; Ḥusayn, Ḥasan al-Hādī (1935) Taʼrīkh ʻUmar ibn al-Khaṭṭāb : awwal ḥākim dīmūqrāṭī fī al-islām. Maktabah al-Jadīdah. ISBN: .