Heywood, D. Ian. <br/><br/>
An introduction to geographical information systems / 
Ian Heywood, Sarah Cornelius, Steve Carver. 
 - 4th ed. 
 - Harlow, England :  Pearson/Prentice Hall,  2011. 
 - xxxiv, 446 p. :  ill. (some col.), maps (some col.) ;  27 cm. 
<br/><br/>Includes bibliographical references (p. [413]-426) and index. 
<br/><br/>
<br/><br/><label>ISBN: </label>9780273722595 (pbk.)  RM180.98 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.