TY  - BOOK
AU  - Azar,Betty Schrampfer
AU  - Hagen,Stacy A.
TI  - Understanding and using English grammar
SN  - 9780132333337 (pbk. with audio) 
PY  - 2009///
CY  - White Plains, NY
PB  - Pearson Education
KW  - English language
KW  -  Textbooks for foreign speakers
KW  -  Grammar
KW  -  Problems, exercises, etc
ER  -