Azar, Betty Schrampfer <br/><br/>
Understanding and using English grammar / 
Betty Schrampfer Azar and Stacy A. Hagen 
 - 4th ed. with answer key 
 - White Plains, NY :  Pearson,  2009 
 - xiii, 530 p. :  ill. (some col.) ;  25 cm. +  2 audio CDs 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>9780132464505 (pbk. : international ed.) 0132464500 (pbk. : international ed.) 9780132333313 (with audio and answer key) 0132333317 (with audio and answer key) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Textbooks for foreign speakers--Textbooks for foreign speakers