APA (7th ed.) Citation

Somerset Fry, P. (1974). British medieval castles. David & Charles.

Chicago Style (17th ed.) Citation

Somerset Fry, Plantagenet. British Medieval Castles. Newton Abbot u.a: David & Charles, 1974.

MLA (9th ed.) Citation

Somerset Fry, Plantagenet. British Medieval Castles. David & Charles, 1974.

Warning: These citations may not always be 100% accurate.