5Langaeker, Ronald W. (1987) Foundations of Cognitive Grammar-Theoretical Prerequisites. Stanford: Stanford University Press.
6Li, Charles N. , and Sandra A. Thompson. (1974) Historical change of word order: a case study of Chinese and its implications. In John M. Anderson and Charles Jones, eds. , Historical linguistics 1 : Syntax, Morphology,Internal and Comparative Reconstruction, 200-17. Amsterdam: Benjamins.