Gude, K., & Duckworth, M. (2002). Proficiency masterclass: Class audio CDs. Oxford: Oxford University Press.
Chicago Style CitationGude, Kathy, and Michael Duckworth. Proficiency Masterclass: Class Audio CDs. Oxford: Oxford University Press, 2002.
MLA CitationGude, Kathy, and Michael Duckworth. Proficiency Masterclass: Class Audio CDs. Oxford: Oxford University Press, 2002.
Warning: These citations may not always be 100% accurate.