TY  - BOOK
AU  - Azar,Betty Schrampfer
AU  - Hagen, Stacy A.,
TI  - Understanding and using English grammar : : with answer key 
SN  - 9780132333313 (with audio)
AV  - PE1128 A992Ua 2009
PY  - 2009///
CY  - White Plains, NY
PB  - Pearson Education
KW  - English language
KW  - Textbooks for foreign speakers
KW  - Grammar
KW  - Problems, exercises, etc
ER  -