APA (7th ed.) Citation

Barlow, S., & Langridge, S. (1996). The twentieth century: What really happened. Kingfisher.

Chicago Style (17th ed.) Citation

Barlow, Steve, and Steve Langridge. The Twentieth Century: What Really Happened. London: Kingfisher, 1996.

MLA (9th ed.) Citation

Barlow, Steve, and Steve Langridge. The Twentieth Century: What Really Happened. Kingfisher, 1996.

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