Murphy, Raymond <br/><br/>
Essential grammar in use :  a self-study reference and practice book for elementary students of english with answers / 
Raymond Murphy. 
 - Cambridge :  Cambridge University Press,  c2007. 
 - 319 p. : col. ill. ; 27 cm. 
<br/><br/> Includes Index 
<br/><br/><label>ISBN: </label>9780521675437 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Textbooks for foreign speakers<br/>English language--Grammar Problems, exercises,etc.