Buck, Edward R. <br/><br/>
Introduction to data security and controls / 
Edward R. Buck. 
 - Wellesky, Mass. :  Q.E.D. Information Sciences Inc.,  1982. 
 - 247 p. :  ill. ;  28 cm. 
<br/><br/>p.229-247. 
<br/><br/><label>ISBN: </label>0894350625 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers--Access control.<br/>Electronic data processing departments--Security measures.