References
- Arbib , M. A. (2006) (ed.) Action to Language via the Mirror Neuron System. Cambridge University Press.
- Fitch, W.T. (2000) ‘The evolution of speech: a comparative review.' Trends in Cognitive Sciences 4: 258-267.
- Roux, V. & Bril , B. (2005) ( eds ) Stone knapping : the necessary conditions for a uniquely hominin behaviour . Cambridge : MacDonald Institute.