Masterman, J. C.  1891- <br/><br/>
The double-cross system in the war of 1939 to 1945 / 
by J. C. Masterman 
 - New Haven :  Yale University Press,  1972 
 - xxi, 203 p. ;  22 cm. 
<br/><br/><label>ISBN: </label>0300014961 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World War--Secret service--United Kigdom--1939-1945