Davidson, I. (2003) The archaeological evidence of language origins: States of the art. In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art . Oxford University Press.

Davidson, I. (2003) The archaeological evidence of language origins: States of the art. In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art. Oxford University Press.

2008	-	Language as shaped by the brain - Christiansen,Chater	::	5
		Davidson, I. (2003) The archaeological evidence of language origins: States of art. In: Language evolution, ed. M. H. Christiansen & S. Kirby, pp. 140-57. Oxford University Press.
2003	-	Language Evolution: Consensus and Controversies - Christiansen,Kirby	::	14
		23 Davidson, I. (2003) The archaeological evidence of language origins: States of art. In Language Evolution (Christiansen, M.H. and Kirby, S., eds) Oxford University Press