Koenig, C. L., & Oxenden, C. (2013). American English file: Online practice. Oxford: Oxford University Press.
シカゴスタイル引用形Koenig, Chistina Latham, , Clive Oxenden. American English File: Online Practice. Oxford: Oxford University Press, 2013.
MLA引用形式Koenig, Chistina Latham, , Clive Oxenden. American English File: Online Practice. Oxford: Oxford University Press, 2013.
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