Whiten,A.,J.Goodall,W.C.McGrew,T.Nishida,V.Reynolds,Y.Sugiyama,C.E.G.Tutin,R.Wrangham,and C.Boesch.1999.Cultures in chimpanzees.Nature,399,682-685.
Wilson,E.O.2012.The social conquest of earth.New York:Liveright.
Wittgenstein,L.1955.Philosophical investigations.Oxford:Basil Blackwell.
Wobber,V.,B.Hare,E.Herrmann,R.Wrangham,and M.Tomasello.In press.The evolution of cognitive development in Homo and Pan.Developmental Psychobiology.