IELTS :  International English Language Testing System /. 

 - Second edition 
 - New York :  Kaplan Publishing,  2011. 
 - 253 p. :  ill. + 1 CD-ROM (4 3/4 in.) ;  28 cm. 
<br/><br/><label>ISBN: </label>978-1-60714-655-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Languages ​​of the World