Cita APA

Duckworth, M. (2008). Countdown to first certificate: (Student's book). Oxford: Oxford University Press.

Citación estilo Chicago

Duckworth, Michael. Countdown to First Certificate: (Student's Book). Oxford: Oxford University Press, 2008.

Cita MLA

Duckworth, Michael. Countdown to First Certificate: (Student's Book). Oxford: Oxford University Press, 2008.

Precaución: Estas citas no son 100% exactas.