Knight, C. (2000) Play as a precursor of phonology and syntax. 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.

Knight, C. (2000) Play as a precursor of phonology and syntax. 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.

Hurford, The Language Mosaic and its Evolution, 2003	::	7
Knight,Power, Unravelling Digital Infinity, 2008	::
Knight, Language co-evolved with the rule of law, 2008	::