Umar ibn Hafs Hazarmard (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Umar ibn Hafs Hazarmard" in English language version.

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Kennedy 1981, p. 190. Kennedy, Hugh (1981). The Early 'Abbasid Caliphate: A Political History. London: Croom Helm. ISBN 0-389-20018-2.
Al-Ya'qubi 1883, p. 448. Al-Ya'qubi, Ahmad ibn Abu Ya'qub (1883). Houtsma, M. Th. (ed.). Historiae, Vol. 2 (in Arabic). Leiden: E. J. Brill.
Al-Ya'qubi 1883, pp. 464–65. Al-Ya'qubi, Ahmad ibn Abu Ya'qub (1883). Houtsma, M. Th. (ed.). Historiae, Vol. 2 (in Arabic). Leiden: E. J. Brill.
Kennedy 1981, pp. 190–91. Kennedy, Hugh (1981). The Early 'Abbasid Caliphate: A Political History. London: Croom Helm. ISBN 0-389-20018-2.
Kennedy 1981, p. 191. Kennedy, Hugh (1981). The Early 'Abbasid Caliphate: A Political History. London: Croom Helm. ISBN 0-389-20018-2.
Al-Ya'qubi 1883, pp. 464-65, has 'Umar's death occurring in the prior year Al-Ya'qubi, Ahmad ibn Abu Ya'qub (1883). Houtsma, M. Th. (ed.). Historiae, Vol. 2 (in Arabic). Leiden: E. J. Brill.