Llewellyn, Robert W. <br/><br/>
Information systems / 
Robert W. Llewellyn. 
 - Englewood, Cliffs, New Jersey :  Prentice-Hall,  c1976. 
 - xiv, 347 p. :  ill. 
<br/><br/><label>ISBN: </label>0134644875 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Management information systems.