8Ellis, R. The Study of Second Language Acquisition(2nd edition)[M].Oxford: Oxford University Press, 2008.
9Kramsch, C. Second language acquisition, applied linguistics, and the teaching of foreign languages [J]. The Modem Language Journal, 2000,84(3): 311-326.
10Larshen-Freeman, D. Complexity theory [A]. In S. Gass & Mackey (eds.). The Routledage Handbook of Second Language Acquisition [C]. Abingdon, Oxon: Routledge, 2012: 73-88.
