4Chomsky, N. Aspects of the Theory of Syntax [M]. Cambridge, Mass.: MIT Press, 1965.
5Chomsky, N. Some notes on economy of derivation and representation [A]. Robert Freidin. Principles and Parameters in Comparative Grammar [C]. Cambridge, Mass: MIT Press, 1991. 412-454.
6Chomsky, N. A minimalist program for linguistic theory [A]. MIT Occasional Papers in Linguistics[C]. 1992.
7Dryer, M. S. The Greenbergian word order correlations [J]. Language, 1992, 68: 81-138.
8Fukui, N. Parameters and optionality [J]. Linguistic Inquiry, 1993, 24: 399-420.
9Greenberg, J. H. Some universals of grammar with particular reference to the order of meaningful elements[A].J.H. Greenberg. Universal of Human Langue 4: Syntax [C]. Cambridge, Mass.: MIT Press, 1966.
10Hawkins, J. A. A parsing theory of word order universals [J]. Linguistic Inquiry, 1990, 21(2): 223-261.
