APA Alıntı

Duckworth, M., & Gude, K. (1999). Countdown to first certificate: Student's book. Oxford: Oxford University Press.

Chicago Stili Alıntı

Duckworth, Michael., ve Kathy Gude. Countdown to First Certificate: Student's Book. Oxford: Oxford University Press, 1999.

MLA Alıntı

Duckworth, Michael., ve Kathy Gude. Countdown to First Certificate: Student's Book. Oxford: Oxford University Press, 1999.