Duckworth, M. (2009). Countdown to first certificate: (Student's book). Oxford: Oxford University Press.
Stile di citazione ChicagoDuckworth, Michael. Countdown to First Certificate: (Student's Book). Oxford: Oxford University Press, 2009.
Citazione MLADuckworth, Michael. Countdown to First Certificate: (Student's Book). Oxford: Oxford University Press, 2009.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.