Heywood, D. Ian. <br/><br/>
An introduction to geographical information systems / 
Ian Heywood, Sarah Cornelius, Steve Carver. 
 - 3rd ed. 
 - Harlow, England :  Pearson/Prentice Hall,  2006. 
 - xxxiii, 426 p. :  col. ill. ;  27 cm. 
<br/><br/>Includes bibliographical references (p. [400]-411) and index. 
<br/><br/>
<br/><br/><label>ISBN: </label>0131293176 (pbk.)  RM176.96 9780131293175 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.