Cita APA

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

Citación estilo Chicago

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

Cita MLA

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