7E.B. Zechmeister, A.M. Chronis, W.L. Cull, C.A. D'Anna and N.A. Bealy, Growth of a functionally important lexicon, Journal of Reading Behavior, 1995, 27(2).
8nirsh, D. & Nation, P. What vocabulary size is needed to read unsimplified texts for pleasure? Reading in a Foreign Language, 1992.
9Krashen, S. Principles and Practice in Second Language Acquisition, Englewood Cliffs, N]: Prentice Hall, 1982.
10Rod Ellis. Understanding Second LanguageAcquisition,上海外语教育出版社,1999.
