Bruce J Walker, Ian F Blake <br/><br/>
Computer security and protection structures 

 - Dowden, Hutchinson & Ross,Inc, Stroudsburg  c1977 
 - ix,142p 
<br/><br/><label>ISBN: </label>0-87933-247-6 
<br/><br/><label>Dewey Class. No.: </label>001.644 Wal/Bla