एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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