History of Islam
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The Quest for the Historical Muhammad
Author: Ibn Warraq
Publisher: Prometheus Books
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Muslim Studies
Author: Ignaz Goldziher
Publisher: George Allen and Unwin
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The Succession to Muhammad: A Study of the Early Caliphate
Author: Wilferd Madelung
Publisher: Cambridge: CUP
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Annali dell ʼIslam
Author: Leone Caetani
Publisher: Ulrico Hoepli