Mackey, A., & Gass, S. M. (2012). Research methods in second language acquisition: A practical guide. Wiley-Blackwell.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMackey, Alison, और Susan M. Gass. Research Methods in Second Language Acquisition: A Practical Guide. Chichester, West Sussex ; Malden, Mass.: Wiley-Blackwell, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMackey, Alison, और Susan M. Gass. Research Methods in Second Language Acquisition: A Practical Guide. Wiley-Blackwell, 2012.
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