O'Neil, B. H. (1960). Castles: An introd. to the castles of England and Wales (5. impr.). Her Majesty's Stationery Office.
Chicago Style (17th ed.) CitationO'Neil, Bryan H. Castles: An Introd. to the Castles of England and Wales. 5. impr. London: Her Majesty's Stationery Office, 1960.
MLA (9th ed.) CitationO'Neil, Bryan H. Castles: An Introd. to the Castles of England and Wales. 5. impr. Her Majesty's Stationery Office, 1960.
Warning: These citations may not always be 100% accurate.