Pritchard, J. A. T., <br/><br/>
Computer security :  facts and figures / 
by J. A. T. Pritchard 
 - Manchester (Eng.) :  NCC Publications,  1979 
 - Various pagings ;  30 cm. 
<br/><br/><label>ISBN: </label>C81-453659 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric data processing departments--Security measures<br/>Computers--Access control