Koenig, C. L., Oxenden, C., & Paul Seligson. (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, , Paul Seligson. American English File: Online Practice. Oxford: Oxford University Press, 2013.
MLA引用形式Koenig, Chistina Latham, Clive Oxenden, , Paul Seligson. American English File: Online Practice. Oxford: Oxford University Press, 2013.
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