Churchhouse, R. F. <br/><br/>
Codes and Ciphers  Julius Caesar, the Enigma, and the Internet 

 - Cambridge  CUP  2002 
 - x+240p., 23X15Cms. 
<br/><br/><label>ISBN: </label>052181054X 
<br/><br/><label>Dewey Class. No.: </label>621.38196428 C561