एपीए उद्धरण

O'Connell, S. (2002). Focus on IELTS. London: Pearson education.

शिकागो स्टाइल उद्धरण

O'Connell, Sue. Focus On IELTS. London: Pearson education, 2002.

एमएलए उद्धरण

O'Connell, Sue. Focus On IELTS. London: Pearson education, 2002.