Kennedy, H., & Barbir, K. K. (2003). The Prophet and the age of the Caliphates: The Islamic Near East from the sixth to the eleventh century (2nd ed.). Longman.

Kennedy, Hugh, and Karl K. Barbir. The Prophet and the Age of the Caliphates: The Islamic Near East from the Sixth to the Eleventh Century. 2nd ed. Harlow: Longman, 2003.

Kennedy, Hugh, and Karl K. Barbir. The Prophet and the Age of the Caliphates: The Islamic Near East from the Sixth to the Eleventh Century. 2nd ed. Longman, 2003.