1. Martin Nowak and Roger Highfield, Super Cooperators: Altruism, Evolution, and Why We Need Each Other to Succeed (New York: Free Press, 2011)
2. Samuel Bowles and Herbert Gintis, A Cooperative Species: Human Reciprocity and its Evolution (Princeton, NJ: Princeton University Press, 2010)
3. Michael Tomasello, Why We Cooperate (Boston: Massachusetts Institute of Technology, 2009)
4. Origins of Human Communication (Boston: Massachusetts Institute of Technology, 2008)
5. Jeremy Rifkin, The Empathic Civilization: The Race to Global Consciousness in a World in Crisis (New York: Penguin Books, 2009)