Gude, K., & Duckworth, M. (1998). Proficiency masterclass: Workbook with answers. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoGude, Kathy., và Michael Duckworth. Proficiency Masterclass: Workbook With Answers. Oxford: Oxford University Press, 1998.
MLA CitationGude, Kathy., và Michael Duckworth. Proficiency Masterclass: Workbook With Answers. Oxford: Oxford University Press, 1998.
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