Vickery, B. C. <br/><br/>
Information systems 

 - London:   The Butterworth Group,    1973 
 - 349p. 
<br/><br/><label>ISBN: </label>0-408-70456-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information technology
<br/><br/><label>Subjects--Index Terms: </label>Retrieval subsystem 
<br/><br/><label>Universal Decimal Class. No.: </label>RR 025.5  / L3