C.E. Bosworth, "The Appearance of the Arabs in Central Asia under the Umayyads and the establishment of Islam", in History of Civilizations of Central Asia, Vol. IV: The Age of Achievement: AD 750 to the End of the Fifteenth Century, Part One: The Historical, Social and Economic Setting, edited by M. S. Asimov and C. E. Bosworth. Multiple History Series. Paris: Motilal Banarsidass Publ. /UNESCO Publishing, 1999. excerpt from page 23: [۱]
