Deacon, T. W. (2003) Universal Grammar and semiotic constraints. In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art . Oxford University Press.

Deacon, T. W. (2003) Universal Grammar and semiotic constraints. In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art. Oxford University Press.

2006	-	Working backwards from modern language to proto-grammar - Johansson	::
		Deacon, T. (2003). Universal grammar and semiotic constraints. In M. H. Christiansen & S. Kirby (Eds.), Language evolution. Oxford: Oxford University Press.
2003	-	Language Evolution: Consensus and Controversies - Christiansen,Kirby	::	8
		11 Deacon, T.W. (2003) Universal grammar and semiotic constraints. In Language Evolution (Christiansen, M.H. and Kirby, S., eds) Oxford University Press