Jeffery, Keith. <br/><br/>
MI6 :  the history of the Secret Intelligence Service, 1909-1949 / 
Keith Jeffery. 
 - London :  Bloomsbury,  2010. 
 - xxi, 810p. 
<br/><br/><label>ISBN: </label>9780747591832 
<br/><br/><label>Subjects--Corporate Names: </label><br/>Great Britain. MI6 --History.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intelligence service--History--Great Britain--20th century.