Azar, Betty Schrampfer <br/><br/>
Understanding and using English grammar 

 - 3a ed. 
 - Estados Unidos :  Longman,  1999 
 - 437 p. :   20 x 25 cm. 
<br/><br/><label>ISBN: </label>0-13-958661-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language
<br/><br/><label>LC Class. No.: </label>PE1128  / A92