APA (7th ed.) Citation

Duckworth, M., & Gude, K. (1991). Success at first certificate. Oxford University Press.

Chicago Style (17th ed.) Citation

Duckworth, M., and K. Gude. Success at First Certificate. Oxford: Oxford University Press, 1991.

MLA (9th ed.) Citation

Duckworth, M., and K. Gude. Success at First Certificate. Oxford University Press, 1991.

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