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1. E. Kaufmann and H. W. Kaufmann, The Medieval Fortress: Castles, Forts and Walled Cities of the Middle Ages, Cambridge: De Capo Press, 2004 – US Readers
2. Ivy A. Corfis and Michael Wolfe (eds) The Medieval City Under Siege, Woodbridge: Boydell Press, 1995 – US Readers
3. Jean-Denis G.G. Lepage, Castles and Fortified Cities of Medieval Europe: An Illustrated History (London: McFarland, 2002 – US Readers
4. Thomas Wright, The History of France: From the Earliest Period to the Present Time, vol. 1, London: The London Printing and Publishing Company, 1856-1862 – US Readers
5. Sidney Toy, Castles: Their Construction and History, New York: Dover Publications, 1985 – US Readers
6. Sidney Toy, A History of Fortification from 3000 BC to AD 1700, Barnsley: Pen and Sword Military Classics, 2006 – US Readers
7. John R. Kenyon, Medieval Fortifications, New York: St. Martin’s Press, 1990 – US Readers
8. Eugene-Emmanuel Viollet-le-Duc, Castles and Warfare in the Middle Ages, translated by M. Macdermott, New York: Dover Publications, 2005 – US Readers
9. Diane M. Williams and John R. Kenyon, eds, The Impact of the Edwardian Castles in Wales, Oxford: Oxbow Books, 2010 – US Readers