Betsis, Andrew. <br/><br/>
IELTS :  the grammar files : English usage upper intermediate : teacher's book : b2 / 
Andrew Betsis, Lawrence Mamas. 
 - United Kingdom :  Global ELT. 
 - 63 p. :  ill. ;  29 cm. 
<br/><br/> Score: 5.0 - 5.5 - 6.0. 
<br/><br/><label>ISBN: </label>9781904663546 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--usage.