References
Bonner, J. T.1980. The Evolution of Cultural Evolution in Animals. Princeton : Princeton Univ. Press.
Dawkins, Richard. 1976. The Selfish Gene. New York : Oxford Univ. Press.
Pennisi, Elizabeth. 2009. “On the Origin of Cooperation.Science 325:1196–99.
Roughgarden, Joan. 2004. Evolution's Rainbow: Why Darwin Was Wrong about Sexual Selection. Berkeley and Los Angeles : Univ. of California Press.