Christiansen, M. H. and Kirby, S. (2003) Language Evolution: The Hardest Problem in Science? In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art . Oxford University Press.

Christiansen, M. H. and Kirby, S. (2003) Language Evolution: The Hardest Problem in Science? In M.H. Christiansen and S. Kirby, editors, Language Evolution: The States of the Art. Oxford University Press.

2007	-	The Role of Anticipation in the Emergence of Language - Swarup,Gasser	::
		[58] Christiansen, M.H., Kirby, S.: Language evolution: The hardest problem in science? In Christiansen, M., Kirby, S., eds.: Language Evolution: The States of the Art. Oxford University Press (2003)
2006	-	Selective scenarios for the emergence of natural language - Szamado,Szathmary	::
		9. Christiansen, M. & Kirby, S. (2003) Language evolution: the hardest problem in science? In: Christiansen, M. & Kirby, S. (eds) Language Evolution. Oxford University Press, Oxford. pp. 1-15.
2006	-	Language and life history: A new perspective on the development and evolution of human language - Locke,Bogin	::	2
		Christiansen, M., & Kirby, S. (2003b). Language evolution: the hardest problem in science? In Christiansen, M., & Kirby, S. (Eds.), Language evolution. Oxford: Oxford University Press.
2005	-	The Major Transitions in the Evolution of Language - Zuidema	::	1
		CHRISTIANSEN, M. H. & KIRBY, S. (2003c). Language evolution: The hardest problem in science? In: Christiansen & Kirby (2003a), pp. 1--15.
2004	-	Review of ``Linguistic evolution through language acquisition: Formal and computational models'' by Ted Briscoe, 2002 - Edelman,Pedersen	::	1
		Christiansen, M. H. and Kirby, S. (2003). Language evolution: the hardest problem in science? In Christiansen, M. H. and Kirby, S., editors, Language Evolution, pages 1--15. Oxford University Press.