TY  - GEN
AU  - Latham-Koenig, Christina,
AU  -  Oxenden, Clive. 
AU  - Seligson, Paul. 
TI  - English File: : elementary student's book / 
SN  - 9780194598569
PY  - 2012///
CY  - Oxford
PB  - Oxford University Press
KW  - English language
KW  - Study and teaching
KW  - Foreign speakers
KW  - Grammar
KW  - Problems, exercises, etc
ER  -