1Adamson, H. D &C. Kova. Variation theory and second language acquisition data: An analysis of Schurmnn's data[A]//In David Sankof & Hetrietta Cedergren(ed), Variation Omnibus Ednlonton: Linguistic Research, Inc, 1981.
2de Bot, K. , W. Lowie & M Verstxxgr. Seoond Laguage Acquisition: An Advanced Resource Book[M].London: Routledge,2005.
3de Bot, K. , W. Lowie & M Verspoor. Dynamic Systms Theory approach to second language acquisition[J]. Bilingualism,2007,10(1) :7-21.
4de Bot, K. lnnwduction: Second language devdotxnent as a dynamic process [J]. The Modem Language Journal 2008,92:166-178.
5Ellis, R. Souroes of variability in interlanguage[J]. Applied Lnguistics 1985,6 (2): 118-131.
6Larsen-Freeman, D. Chaos/complexity science and sccond larguage acquisition. Applied Linguistics, 1997,18:141- 165.
7Hopper, R Emergent grammar[J]. Berkeley Linguistics Society 1987,13:139 - 157.
8Larsen-Freman, D The emergence of axnplexity, fluency, and accuracy in the oval and written produetion of five Chinese learners of English[J]. Applied Linguistics, 2006,27(4).
9Larsen-Froarem, D. Adjusting expectations: The stuty of complexity, accuracy, arrt fluency in second language acquisition[J]. Applied Linguistics 2009, 30: 579- 589.
10Larsen-Frceman,D.&L Cameron Reserch methodology on language development from a Complex Systems perspective[J]. The Modem LanguageJournal, 2008,92:200-213.