* Keen, Maurice; "Chivalry", New Haven: Yale University Press, 1984, ISBN 0-300-03150-5* Robards, Brooks; "The Medieval Knight at War", UK: Tiger Books, 1997, ISBN 1-85501-919-1
* Keen, Maurice; "Chivalry", Yale University Press, 1984, ISBN 0-300-03150-5* Robards, Brooks; "The Medieval Knight at War", UK: Tiger Books, 1997, ISBN 1-85501-919-1