Heywood, D. Ian. <br/><br/>
An introduction to geographical information systems / 
Ian Heywood , Sarah Cornelius, Steve Carver. 
 - 4th ed. 
 - Harlow, England ;   Toronto :  Prentice Hall,   2011. 
 - xxxiv, 446 p. :  col. ill. ;   27 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780273722595 (pbk.) 
<br/><br/><label>LCCN: </label>2011-002783 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.
<br/><br/><label>Dewey Class. No.: </label>910.285