TY  - BOOK
AU  - Doff, Adrian
AU  - Goldstein, Ben
TI  - English unlimited: C1 Advanced with e-portfolio DVD ROM for windows and mac 
SN  - 9780521144452
AV  - DVD 428 ADV 2011
PY  - 2011///
CY  - United Kingdom
PB  - Cambridge University Press
KW  - Standard Enlgish usage
ER  -