[11]DeKeyser, R. M. The Robustness of Critical Period Effects in Second Language Acquisition[J]. Studies in Second Language Acquisition, 2000, 22(4): 499-533.
[13]Hellman A B. Vocabulary size and depth ofword knowledge in adult-onset second language acquisition[J]. International Journal of Applied Linguistics, 2011(21):162-182.
[14]Baker W. Effects of age and experience onthe production of English word-final stops by Koreanspeakers[J]. Bilingualism: Language and Cognition,