Duckworth M. Michael & Gude K. Kathy. (2004). Countdown to First Certificate: Student's book. Oxford, Oxford University Press, 2004.
Lua i Stíl Chicago (17ú heag.)Duckworth M. Michael agus Gude K. Kathy. Countdown to First Certificate: Student's Book. Oxford, Oxford University Press, 2004, 2004.
Lua MLA (9ú heag.)Duckworth M. Michael agus Gude K. Kathy. Countdown to First Certificate: Student's Book. Oxford, Oxford University Press, 2004, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.