TY  - BOOK
AU  - Soars,John
AU  - Soars,Liz
TI  - Headway: student's book. Pre-intermediate 
U1  - 421.5 S676sb 1991 
PY  - 1991///
CY  - Oxford
PB  - Oxford University Press, 
KW  - INGLES
KW  - TEXTO DE ESTUDIO
ER  -