APA aipamena

Roberts, R. (2004). IELTS foundation: Study skills. Oxford: McMillan.

Chicago Style aipamena

Roberts, Racheal. IELTS Foundation: Study Skills. Oxford: McMillan, 2004.

MLA aipamena

Roberts, Racheal. IELTS Foundation: Study Skills. Oxford: McMillan, 2004.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.