Carstairs-McCarthy, A. (2000) The distinction between sentences and noun phrases: An impediment to language evolution? 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.

Carstairs-McCarthy, A. (2000) The distinction between sentences and noun phrases: An impediment to language evolution? 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.

Briscoe, Grammatical Assimilation, 2003	::	8
Christiansen,Kirby, Language Evolution: Consensus and Controversies, 2003	::	8