APA aipamena

Gude, K., & Duckworth, M. (1994). Proficiency masterclass: Teacher's book. Oxford: Oxford University Press.

Chicago Style aipamena

Gude, Kathy., và Michael Duckworth. Proficiency Masterclass: Teacher's Book. Oxford: Oxford University Press, 1994.

MLA aipamena

Gude, Kathy., và Michael Duckworth. Proficiency Masterclass: Teacher's Book. Oxford: Oxford University Press, 1994.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.