APA (7th ed.) Citation

O'Hagan, S. (2017). Secret cities. BBC Worldwide.

Chicago Style (17th ed.) Citation

O'Hagan, Steve. Secret Cities. London, England: BBC Worldwide, 2017.

MLA (9th ed.) Citation

O'Hagan, Steve. Secret Cities. BBC Worldwide, 2017.

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