Focus on Grammar :  An Advanced course for reference and practice / 
Koch Rachel Spack ; Keith S. Folse  
 - 2nd ed. 
 - New York:  Longman,  2000. 
 - v,218 p,: 
<br/><br/><label>ISBN: </label>0201383144 
<br/><br/><label>LC Class. No.: </label>PE1128  / .F62  2000