Duckworth, M. (2008). Countdown to first certificate: (Student's book). Oxford: Oxford University Press.
シカゴスタイル引用形Duckworth, Michael. Countdown to First Certificate: (Student's Book). Oxford: Oxford University Press, 2008.
MLA引用形式Duckworth, Michael. Countdown to First Certificate: (Student's Book). Oxford: Oxford University Press, 2008.
警告: この引用は必ずしも正確ではありません.