search materials(including e-books and e-journals) held by Hokkaido university.
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Search keyword：(Author: #Flege James Emil)
Second language acquisition and the critical period hypothesis / edited by David Birdsong
Mahwah, N.J. : L. Erlbuam Associates , 1999
(Second language acquisition research : theoretical and methodological issues / Susan M. Gass, Jacquelyn Schac[h]ter, series editors)