Cita APA (7a ed.)

O'neil, B. H. S. J. (1977). Castles: An introduction to the castles of England and Wales. Her Majesty's Stationery Office.

Cita Chicago Style (17a ed.)

O'neil, B. H. St. J. Castles: An Introduction to the Castles of England and Wales. London: Her Majesty's Stationery Office, 1977.

Cita MLA (9a ed.)

O'neil, B. H. St. J. Castles: An Introduction to the Castles of England and Wales. Her Majesty's Stationery Office, 1977.