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Heath, I.  (1989). Armies of Feudal Europe 1066-1300 (2nd ed.).  Wargames Research Group.

Kennedy, H.  (1996). Muslim Spain and Portugal: A political history of al-Andalus.  London: Longman.

Lewis, David Levering, God's Crucible: Islam and the Making of Europe, 570 to 1215 (New York: W & W Norton Inc, 2008), ISBN 0-393-06472-7.

Livermore, H. V.(1966) A New History of Portugal.  Cambridge University Press.

Nicolle, D.(1988) El Cid and the Reconquista 1050-1492 (Men-at-Arms 200).  Osprey.

Smith, C.(1989–92) Christians and Moors in Spain, Aris & Phillips