Davis, William S. <br/><br/>
Information processing systems / 
William S. Davis 
 - 2nd ed 
 - Reading  AddiSon-Wesley  1981 
 - 504p.  ill.  24cm. 
<br/><br/><label>ISBN: </label>0201031833 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic data processing