Thomson, A.J. <br/><br/>
A practical english grammar exercises 6: indirect speech and passive voice 

 - 5A ed. 
 - Great Britain :   Oxford University Press,  1969  
<br/><br/><label>Standard No.: </label>DBA002665 
<br/><br/><label>Subjects--Topical Terms: </label><br/>--OTROS--