Doff, A., & Jones, C. (1997). Language in use: Upper-intermediate : self-study workbook. Cambridge: Cambridge U. P..
シカゴスタイル引用形Doff, Adrian, , Christopher Jones. Language in Use: Upper-intermediate : Self-study Workbook. Cambridge: Cambridge U. P., 1997.
MLA引用形式Doff, Adrian, , Christopher Jones. Language in Use: Upper-intermediate : Self-study Workbook. Cambridge: Cambridge U. P., 1997.
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