APA (7th ed.) Citation

Humble, R. (1984). English castles / Richard Humble. English Tourist Board.

Chicago Style (17th ed.) Citation

Humble, Richard. English Castles / Richard Humble. London: English Tourist Board, 1984.

MLA (9th ed.) Citation

Humble, Richard. English Castles / Richard Humble. English Tourist Board, 1984.

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