@book{UBHD-1046924, author={Somerset Fry, Plantagenet}, title={British medieval castles}, publisher={David & Charles}, address={London}, year={1974}, pages={176 S.}, language={eng}, isbn={0-7153-6304-2 and 978-0-7153-6304-1}, library={UB [Signatur: 75 B 2690]}, }