Duckworth, M. (2009). Countdown to first certificate. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoDuckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 2009.
ציטוט MLADuckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 2009.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.