TY  - BOOK
AU  - Doff, Adrain
TI  - English unlimited: C1 advanced coursebook with e-Portfolio 
SN  - 9780521144452
AV  - PE 1128 .D653 2011 
U1  - IB 428  
PY  - 2011///
CY  - Cambridge 
PB  - Cambridge University Press
KW  -  Service learning--Case studies
KW  - International baccalaureate
KW  - Social aspects
KW  - Case studies
ER  -