एपीए उद्धरण

Michael Duckworth. (2000). Countdown to first certificate ( Workbook ). Oxford: Oxford Univ. Press.

शिकागो स्टाइल उद्धरण

Michael Duckworth. Countdown to First Certificate ( Workbook ). Oxford: Oxford Univ. Press, 2000.

एमएलए उद्धरण

Michael Duckworth. Countdown to First Certificate ( Workbook ). Oxford: Oxford Univ. Press, 2000.