\ Christina Latham-Koenig, Clive Oxenden, Paul Seligson
Third edition
Oxford
: Oxford University Press
, 2012
5 v.
:chiefly col. ill.
+5 CD-ROM
Bibliography
v. 1. Elementary Workbook.- v. 2. Pre-intermediate Workbook.- v. 3. Intermediate Workbook.- v. 4. Intermediate Plus Workbook.- v. 5. Upper-intermediate Workbook.