TY  - BOOK
AU  - Lewis,Richard G.
TI  - Advance your english: a communicative grammar course for upper intermediate and advanced students 
U1  - 428 L675a 1984 
PY  - 1984///
CY  - London
PB  - Hodder and Stonghton, 
KW  - INGLES
KW  - TEXTO DE ESTUDIO
ER  -