TY  - BOOK
AU  - Hewings,Martin
TI  - Advanced Grammar in Use: a self-study reference and practice book for advanced learners of English , with answers 
SN  - 0521498686 (with answers)
PY  - 1999///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Lengua inglesa
KW  - embne
KW  - Gramática
ER  -