1Bernd, H & T Kuteva.2002. World Lexicon of Grammaticalization [M]. Cambridge: Cambridge University Press.
2Ehlich, K 1994. Communication Disruption: On benefits & disadvantages of language contac [A]. In Martin Pu-tz (ed.). Language Contact and Language Conflict [C]. Amsterdam: John Benjamins.
3Fischer, Olga, et al. 1998. The Syntax of Early English [M]. Cambridge: Cambridge University Press.
4Hurford, J R et al. ( eds. ). 1998. Approaches to the Evolution of Language [C]. Cambridge: Cambridge University Press.
5Thomason, S G 2001. Language Contact:An introduction [M]. Edinburgh: Edinburgh University Press.
6Bemd, H. & T. Kuteva. 2002. World L exicon of Grammaticalization [M]. Cambridge: Cambridge University Press.
7Ehlich, K. 1994. Communication Disruption: On benefits & disadvantages of language contac [ A]. In Martin Pü-tz (ed.). Language Contact and Language Conflict [C]. Amsterdam: John Benjamins.
8Fischer, Olga, et. al. 1998. The Syntax of Early English [M]. Cambridge: Cambridge University Press.
9Hurford, J. R. et al. (eds.). 1998. Approaches to the Evolution of Language [C]. Cambridge: Cambridge University Press.
10Thomason, S. G. 2001. Language Contact : An introduction [ M ]. Edinburgh: Edinburgh University Press.
