Kippenhahn, Rudolf  . <br/><br/>
Code breaking: a history and exploration /  
by Rudolf Kippenhahn. 
 - Hyderbad :   Universities Press(India) Ltd. ,   2000 
 - 283p ;  
<br/><br/><label>ISBN: </label>81-7371-204-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer- Code Breaking
<br/><br/><label>Dewey Class. No.: </label>BV  / P0;1