Noble, J. (2000) Co-operation, competition and the evolution of pre-linguistic communication. In Chris Knight and James R. Hurford and Michael Studdert-Kennedy, editors, The Evolutionary Emergence of Language: Social Function and the Origins of Linguistic Form . Cambridge: Cambridge University Press.

Noble, J. (2000) Co-operation, competition and the evolution of pre-linguistic communication. In Chris Knight and James R. Hurford and Michael Studdert-Kennedy, editors, The Evolutionary Emergence of Language: Social Function and the Origins of Linguistic Form. Cambridge: Cambridge University Press.

Noble,Paolo,Bullock, Adaptive Factors in the Evolution of Signaling Systems, 2002	::	2
Scott-Phillips, Why talk: an Adaptationist Approach, 2005	::
Szamado,Szathmary, Selective scenarios for the emergence of natural language, 2006	::