Ratzan, Lee <br/><br/>
Understanding information systems:  what they do and why we need them / 
by Lee Ratzan 
 - 1st ed. 
 - New Delhi:  Indiana Publishing House,  2009. 
 - xvi, 253p. 
<br/><br/><label>ISBN: </label>818408238X 
<br/><br/><label>Dewey Class. No.: </label>BV  / P9