Delaney, Julie. <br/><br/>
Geographical information systems :  an introduction / 
Julie Delaney & Kimberly Van Niel. 
 - 2nd  ed. 
 - Oxford :  O. U. P.,  2007. 
 - xviii, 214  p. 
<br/><br/><label>ISBN: </label>0195556070 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.