4Heine, B., U. Claudi & F. Hunnmeyer. Grammaticalization: a Conceptual Framework[M]. Chicago, Chicago University Press. 1991.
5Newmeyer, F. J. Language form and language function. Cam- bridge/MA: MIT Press. 1998.
6Lighffoot , D. The development of language: Acquisition, change, and evolution. Oxford: Blackwell. 1999.
7Lightfoot , D.. Myths and the prehistery of grammars. Journal of Linguistics. 2002, 38.
8Janda, R. D. Beyond "pathways"and "unidirectionality": on the discontinuity of language transmission and"the counterability of gram- maticalizatlon. In Campbell 200lb. 2001.
9Hopper, Paul J. & Elizabeth Closs Trangott. Grammaticalization (second edition) [M]. Cambridge: Cambridge University Press. 2003.
10Langacher, R. W. Syntactic reanalysis. In C. Li ed. Mechanisms of Syntactic Change. 1997.