Ratzan, Lee. <br/><br/>
Understanding information systems  what they do and why we need them /  [electronic resource] : 
Lee Ratzan. 
 - Chicago :  American Library Association,  2004. 
 - 1 online resource 
<br/><br/>Includes bibliographical references (p. 237-245) and index. 
<br/><br/><label>ISBN: </label>9780838908686 9780838998625 (electronic bk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information science.<br/>Information storage and retrieval systems.<br/>Computer science--Popular works.<br/>Mathematics--Popular works.
<br/><br/><label>LC Class. No.: </label>Z665  / .R366 2004