Ratzan, lee <br/><br/>
Understanding information systems  what they do and why we need them 

 - New Delhi  Indiana publishing house  2009 
 - xvi,253p.  HB  24cm. 
<br/><br/><label>ISBN: </label>9788184082388 
<br/><br/><label>Dewey Class. No.: </label>020  / RAT