APA (7th ed.) Citation

Ridley, M. (1997). The origins of virtue. Penguin.

Chicago Style (17th ed.) Citation

Ridley, Matt. The Origins of Virtue. London: Penguin, 1997.

MLA (9th ed.) Citation

Ridley, Matt. The Origins of Virtue. Penguin, 1997.

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