KNIGHTLEY Phillip <br/><br/>
The second oldest profession:  spies and spying in the twentieth century 

 - England:  The Penguin Group Ltd.,  1988 
 - 436p. 
<br/><br/> A broad based overview of the history of espionage which asks whether intelligence operations are necessary. 
<br/><br/><label>ISBN: </label>0140106553 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>INTELLIGENCE OPERATIONS<br/>INTELLIGENCE SERVICES