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1. Arbman, Holger, The Vikings, London: 1961
2. Blockmans, Willem Pieter, Introduction to Medieval Europe, London: 2007
3. Nicholas, David, The Evolution of Medieval World, London: 1992
4. Pounds, Norman John Greville, An Economic History of Medieval Europe, London: 1994
5. Williams, Gareth, “Raiding and Warfare”, The Viking World, edt. Stefan Brink, New York: 2008
2. Blockmans, Willem Pieter, Introduction to Medieval Europe, London: 2007
3. Nicholas, David, The Evolution of Medieval World, London: 1992
4. Pounds, Norman John Greville, An Economic History of Medieval Europe, London: 1994
5. Williams, Gareth, “Raiding and Warfare”, The Viking World, edt. Stefan Brink, New York: 2008