APA aipamena

White, N. M., & N. M. White. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.

Chicago Style aipamena

White, N. M., và N. M. White. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

MLA aipamena

White, N. M., và N. M. White. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.