^The preaching of Islam: a history of the propagation of the Muslim faith By Sir Thomas Walker Arnold, pg. 197
^Devin De Weese, Devin A, ( DeWeese. "Islamization and Native Religion in the Golden Horde", Penn State Press, 1 September 1994,
ISBN0-271-01073-8 pg.3
^The preaching of Islam: a history of the propagation of the Muslim faith By Sir Thomas Walker Arnold, pg. 197
^Devin De Weese, Devin A, ( DeWeese. "Islamization and Native Religion in the Golden Horde", Penn State Press, 1 September 1994,
ISBN0-271-01073-8 pg.3