TY  - BOOK
AU  - Soars,John
AU  - Soars,Liz
TI  - Headway: student's book. Elementary 
U1  - 421.5 S676h 1993 
PY  - 1993///
CY  - Oxford
PB  - Oxford University Press, 
KW  - INGLES
KW  - TEXTO DE ESTUDIO
ER  -