TY  - BOOK
AU  - Paterson,Ken
TI  - Grammar Spectrum 1: elementary 
SN  - 9780194314114
PY  - 2008///
CY  - Oxford [etc.]
PB  - Oxford University Press
KW  - Lenguas Extranjeras
KW  - Gramática
N1  - En la cub.: English rules and practice
ER  -