@book{ BA50609675,
 author = "Gass, Susan M. and Selinker, Larry",
 title = "Second language acquisition : an introductory course",
 publisher = "Lawrence Erlbaum Associates",
 year = "2001",
 edition = "2nd ed",
 URL = "https://ci.nii.ac.jp/ncid/BA50609675"
}
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