7Bloomfield, Leonard. Language[M]. London: George Allen &Unwin Ltd, 1935:22.
8Fries, Charles C. The Bloomfield "School":Trends in European and American Linguistics(1930-1960)[C]. edited on the Occasion of the Ninth International Congress of Linguistics. Christing, et al. Cambridge: Spectrum Publishers, 1962:199.
9Harris, Zellig S. Structural Linguistics[M]. Chicago: the University of Chicago Press, 1951 :iii.
10Waterman. J. T. Perspectives in Linguistics[M]. Chicago: the University of Chicago Press, 1970:98.
