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Business grammar & practice / Michael Duckworth. New ed. Oxford : Oxford University Press, 2003.
Business result : upper-intermediate : student's book / Michael Duckworth & Rebecca Turner ; interactive workbook material by Alastair Lane. +dysk optyczny (CD-ROM). Oxford : Oxford University Press, cop. 2008.
Countdown : to first certificate : workbook with key / Michael Duckworth, Kathy Gude, Jenny Quintana. +1 dysk optyczny. Oxford : Oxford University Press, 2012.
Countdown : to first certificate : student's book / Michael Duckworth, Kathy Gude, Jenny Quintana. Oxford : Oxford University Press, 2012.
New success at First Certificate / Robert O'Neill, Michael Duckworth & Kathy Gude. Oxford [etc.] : Oxford University Press, 1997.
New Success at First Certificate : of3 Books / Gude, Kathy, Duckworth, Michael, O'Neill, Robert. [B.m.] : Oxford Univerisity Press, 1997.
Proficiency masterclass : student's book / Kathy Gude, Michael Duckworth. Oxford [etc.] : Oxford University Press, 2009.
Proficiency masterclass : student's book / Kathy Gude, Michael Duckworth. Oxford : Oxford University Press, 1994.
Voodoo island / Michael Duckworth. 11th impression. Oxford : Oxford University Press, 1997.
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