MacNeilage, P. F. (1998) Evolution of the mechanisms of language output: Comparative neurobiology of vocal and manual communication. In Hurford, J. R. and Studdert-Kennedy, M. and Knight C., editors, Approaches to the Evolution of Language: Social and Cognitive Bases . Cambridge: Cambridge University Press.

MacNeilage, P. F. (1998) Evolution of the mechanisms of language output: Comparative neurobiology of vocal and manual communication. In Hurford, J. R. and Studdert-Kennedy, M. and Knight C., editors, Approaches to the Evolution of Language: Social and Cognitive Bases. Cambridge: Cambridge University Press.

1999	-	Possible stages in the evolution of the language capacity - Jackendoff	::	26
2005	-	The Evolution of Language: A Comparative Review - Fitch	::	2
2002	-	Did language evolve like the vertebrate eye? - Botha	::