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MENGISTU AMBERBER AND PETER COLLINS2002 年出版146 页ISBN：
Language Variation-European Perspectives 5
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SECOND LANGUAGE ACQUISITION AND LINGUISTIC VARIATION
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LANGUAGE VARIATION-EUROPEAN PERSPECTIVES III
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Sources of Variation in First Language Acquisition: Languages
contexts2222 年出版0 页ISBN：
Attitudes towards Language Variation Social and Applied Contexts
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CURRENT ISSUES IN LINGUISTIC THEORY 52:LANGUAGE CHANGE AND VARIATION
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LANGUAGE FACULTY AND BEYOND INTERNAL AND EXTERNAL VARIATION IN LINGUISTICS 5 RESUMPTIVE PRONOUNS AT
ALAIN ROUVERET2011 年出版429 页ISBN：9027208224
LANGUAGE VARIATION AND CHANGE IN THE AMERICAN MIDLAND A NEW LOOK AT‘HEARTLAND’ENGLISH
THOMAS E.MURRAY AND BETH LEE SIMON2006 年出版322 页ISBN：9027248966
