APA aipamena

Roberts, R. (2004). IELTS foundation. Oxford: Macmillan.

Chicago Style aipamena

Roberts, Rachael. IELTS Foundation. Oxford: Macmillan, 2004.

MLA aipamena

Roberts, Rachael. IELTS Foundation. Oxford: Macmillan, 2004.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.