Cita APA (7th ed.)

Conway, D., & Shirreffs, B. (2003). On course for IELTS: Student book. Oxford University Press.

Cita Chicago (17th ed.)

Conway, Darren, i Brett Shirreffs. On Course for IELTS: Student Book. Oxford: Oxford University Press, 2003.

Cita MLA (8th ed.)

Conway, Darren, i Brett Shirreffs. On Course for IELTS: Student Book. Oxford University Press, 2003.