TY  - BOOK
AU  - O'Connell,Sue
TI  - Focus on proficiency: teacher's book 
SN  - 0-17-556419-1
AV  - PE1128 .A2 O26a
PY  - 1992///
CY  - London
PB  - Nelson
N1  - Al pie de la portada: revised and enlarged edition with exam practice material
ER  -