APA aipamena

Michael Duckworth. (2000). Countdown to first certificate ( Student's book ). Oxford: Oxford Univ. Press.

Chicago Style aipamena

Michael Duckworth. Countdown to First Certificate ( Student's Book ). Oxford: Oxford Univ. Press, 2000.

MLA aipamena

Michael Duckworth. Countdown to First Certificate ( Student's Book ). Oxford: Oxford Univ. Press, 2000.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.