Oxenden, C., & Koenig, C. L. (1999). English file: Intermediate student's book. Oxford: Oxford Univ. Press.
シカゴスタイル引用形Oxenden, Clive, , Christina Latham Koenig. English File: Intermediate Student's Book. Oxford: Oxford Univ. Press, 1999.
MLA引用形式Oxenden, Clive, , Christina Latham Koenig. English File: Intermediate Student's Book. Oxford: Oxford Univ. Press, 1999.
警告: この引用は必ずしも正確ではありません.