APA aipamena

Balck, M. (2006). Objective IELTS: Intermediate. Cambridge: Cambridge University Press.

Chicago Style aipamena

Balck, Michael. Objective IELTS: Intermediate. Cambridge: Cambridge University Press, 2006.

MLA aipamena

Balck, Michael. Objective IELTS: Intermediate. Cambridge: Cambridge University Press, 2006.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.