Tomasello, M. (2003) On the different origins of symbols and grammar. In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art . Oxford University Press.

Tomasello, M. (2003) On the different origins of symbols and grammar. In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art. Oxford University Press.

2005	-	The Evolution of Language: A Comparative Review - Fitch	::
		Tomasello, M. (2003) "On the different origins of symbols and grammar" In: Christiansen, M., Kirby, S. eds. , Language Evolution, Oxford University Press, Oxford, pp 94-110
2003	-	Language Evolution: Consensus and Controversies - Christiansen,Kirby	::	8
		22 Tomasello, M. (2003) On the different origins of symbols and grammar. In Language Evolution (Christiansen, M.H. and Kirby, S., eds) Oxford University Press