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Knight, C. (1998) Ritual/speech co-evolution: A 'selfish gene' solution to the problem of deception. 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.

Dessalles, Language and hominid politics, 2000	::	3
Hurford, The Language Mosaic and its Evolution, 2003	::	5
Knight, Language co-evolved with the rule of law, 2006	::
Noble, Co-operation, competition and the evolution of pre-linguistic communication, 2000	::	3
Scott-Phillips, Why talk: an Adaptationist Approach, 2005	::