Knowing one's enemies  intelligence assessment before the two world wars 
/ edited by Ernest R. May 
 - Princeton, N.J.  Princeton University Press  1984 
 - xiii, 561 p. ; 25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0691047170 
<br/><br/><label>LCCN: </label>84-042573 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intelligence service--History--20th century<br/>Military intelligence--History--20th century