Gude, K., & Duckworth, M. (1998). Proficiency masterclass: Workbook with answers. Oxford: Oxford University Press.
Chicago Style CitationGude, Kathy., and Michael Duckworth. Proficiency Masterclass: Workbook With Answers. Oxford: Oxford University Press, 1998.
MLA CitationGude, Kathy., and Michael Duckworth. Proficiency Masterclass: Workbook With Answers. Oxford: Oxford University Press, 1998.
Warning: These citations may not always be 100% accurate.