| Fletcher, The Quest for El Cid 1991 page 152• In 1086, Yusuf IbnTashfin, leader of the Almoravid Empire, killed 24,000 Castillians in the battle of Zallaqa"; Robert J | Reilly, The Contest of Christian and Muslim Spain:1031-1157, Wiley-Blackwell, 1996 , 88• |
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| 1983 , 208 and 209• Codera, Decadencia y Desparicion de los Almoravides en Espana Zaragoza 1899 p | Dupuy, The Harper Encyclopedia of Military history, HarperCollins Publishers, 1993 , 324• Peter Lock, The Routledge Companion to the Crusades 2013 page 1093• Pidal, La Espana del Cid p |
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