MacNeilage, P. F. and Davis, B. L. (2000) Evolution of speech: The relation between ontogeny and phylogeny. 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.

MacNeilage, P. F. and Davis, B. L. (2000) Evolution of speech: The relation between ontogeny and phylogeny. 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.