APA (7th ed.) Citation

Gude, K., & Duckworth, M. (1997). Proficiency masterclass. Oxford University Press.

Chicago Style (17th ed.) Citation

Gude, Kathy, and Michael Duckworth. Proficiency Masterclass. Oxford: Oxford University Press, 1997.

MLA (9th ed.) Citation

Gude, Kathy, and Michael Duckworth. Proficiency Masterclass. Oxford University Press, 1997.

Warning: These citations may not always be 100% accurate.