Azar, Betty Schrampfer <br/><br/>
Understanding and using English grammar :  teacher's guide / 
Betty Schrampfer Azar, Barbara F. Matthies, Shelley Hartle. 
 - 3rd ed. 
 - New York. :  Longman/Person Education,  2001 
 - 244 p. 
<br/><br/><label>ISBN: </label>0139586792 
<br/><br/><label>Subjects--Index Terms: </label>Ngôn ngữ Ngữ pháp Tiếng Anh 
<br/><br/><label>Dewey Class. No.: </label>428.2