TY  - BOOK
AU  - Alexander,L.G.
TI  - Practice and progress: an integrated course for pre-intermediate students 
T2  - New concept English
SN  - 0-582-52330-3
PY  - 1976///
CY  - London
PB  - Longman
KW  - Ingles
KW  - Estudio y enseñanza
ER  -