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.

2003	-	Language Evolution: Consensus and Controversies - Christiansen,Kirby	::	8
2006	-	Working backwards from modern language to proto-grammar - Johansson	::