Title: The Goodness Paradox: The Strange Relationship Between Virtue and Violence in Human Evolution, Author: Richard Wrangham
Title: The Ethical Primate: Humans, Freedom and Morality / Edition 1, Author: Mary Midgley
Title: Human Evolution, Reproduction, and Morality / Edition 1, Author: Lewis Petrinovich
Title: Evolution and Ethics and Other Essays, Author: Thomas Henry Huxley