TY  - BOOK
AU  - Porter,David
TI  - Check your vocabulary for English for academic purposes: a workbook for users 
SN  - 0747566917
U1  - 428.24076 21
PY  - 2003///
CY  - London
PB  - Bloomsbury
KW  - English language
KW  - Textbooks for foreign speakers
KW  - Vocabulary
KW  - Problems, exercises, etc
N1  - Previous ed.: London : Peter Collin, 2001
ER  -