Focus on grammar 3 :  An integrated skills approach : Teacher's manual / 
Silvia Carolina Tiberio... [et al.] 
 - 3rd ed 
 - White Plains, NY :  Pearson Longman,  2006 
 - 215 p. :  ill. 
<br/><br/><label>ISBN: </label>9780131899872 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Textbooks for foreign speakers.<br/>English language--Grammar--Problems, exercises, etc.
<br/><br/><label>LC Class. No.: </label>PE1128  / F652 2006