6Aitchison J. The Seeds of Speech: Language Origin and Evolution [ M ]. Beijing: Foreign Language Teaching and Research Press, 2002.
7Bahn Paul G. Ancient Art [ A ]. Jones S, Martin R, Pilbeam D. ( eds. ) The Cambridge Encyclopedia of Human Evolution [ C ]. Cambridge: Cambridge University Press, 1992. 361 - 364.
8Bolinger D. Aspects of Language[ M]. New York: Harcourt, Brace and World, 1968.
9Byme Richard. The Thinking Ape . Evolutionary Origin of Intelligence [ M ]. Oxford: Oxford University Press, 1995.
10Cann R L, Stoneking M, Wilson A C. Mitochondrial DNA and Human Evolution [ J ]. Nature, 1987, (325) : 31 - 36.