APA (7th ed.) Citation

Ridley, M. (1997). The origins of virtue: Human instincts and the evolution of cooperation. Viking.

Chicago Style (17th ed.) Citation

Ridley, Matt. The Origins of Virtue: Human Instincts and the Evolution of Cooperation. New York: Viking, 1997.

MLA (9th ed.) Citation

Ridley, Matt. The Origins of Virtue: Human Instincts and the Evolution of Cooperation. Viking, 1997.