Duckworth, M. (2008). Countdown to first certificate: (Workbook CD). Oxford: Oxford University Press.
シカゴスタイル引用形Duckworth, Michael. Countdown to First Certificate: (Workbook CD). Oxford: Oxford University Press, 2008.
MLA引用形式Duckworth, Michael. Countdown to First Certificate: (Workbook CD). 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.