Boyd, Robert:

Bettinger, Robert L., Robert Boyd, and Peter J. Richerson
  1996  Style, Function, and Cultural Evolutionary Processes. In Darwinian Archaeologies, edited by Herbert D.G. Maschner, pp. 133-164. Plenum Press, New York.

Boyd, Robert, and Peter J. Richerson
  1985  Culture and the Evolutionary Process. University of Chicago Press, Chicago.