APA (7th ed.) Citation

Barber, N. (2004). Kindness in a cruel world: The evolution of altruism. Prometheus Books.

Chicago Style (17th ed.) Citation

Barber, Nigel. Kindness in a Cruel World: The Evolution of Altruism. Amherst, N.Y.: Prometheus Books, 2004.

MLA (9th ed.) Citation

Barber, Nigel. Kindness in a Cruel World: The Evolution of Altruism. Prometheus Books, 2004.