P. M. Holt. The Age of the Crusades: The Near East from the Eleventh Century to 1517 1986.
Emmanuel Sivan. "The Sanctity of Jerusalem in Islam," Interpretations of Islam 1985.
S. D. Goitein. "The Sanctity of Jerusalem and Palestine in Early Islam," Studies in Islamic History and Institutions
Carol Hillenbrand. The Crusades: Islamic Perspectives 1999.