Barrett, Matthew and Godfrey-Smith, Peter. 2002. “Group Selection, Pluralism, and the Evolution of Altruism [on Sober and Wilson (1998)].”Philosophy and Phenomenological Research 65(3): 685–691.
Further References
Sober, Elliott R. and Wilson, David Sloan. 1998. Unto Others: The Evolution and Psychology of Unselfish Behavior. Cambridge, Massachusetts: Harvard University Press.