7Bauer L & Nation P. Word families [J]. International Journal of Lexicography, 1993, 6(4) : 253-279.
8Bell T. Extensive reading: Why? And how.9 [J/OL]. The Internet TESL Journal, 1998, (12). http://iteslj. org.
9Bertram R, Baayen R & Schreuder R. Effects of family size for complex words [ J ]. Journal of Memory and Language, 2000, (42): 390-405.
10Bertram R, Laine M & Virkkala M. The role of derivational morphology in vocabulary acquisition : Get by with a little help from my morpheme friends [ J]. Scandinavian Journal of Psychology, 2000, 41 (4) : 287-296.