Black, M. (2006). Objective IELTS: Intermediate Workbook with Answers. Cambridge, UK: Cambridge University Press.
シカゴスタイル引用形Black, Michael. Objective IELTS: Intermediate Workbook With Answers. Cambridge, UK: Cambridge University Press, 2006.
MLA引用形式Black, Michael. Objective IELTS: Intermediate Workbook With Answers. Cambridge, UK: Cambridge University Press, 2006.
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