Burrough, P. A. <br/><br/>
Principles of geographical information systems / 
Peter A. Burrough , Rachael A. McDonnell and Christopher D. Lloyd. 
 - 3rd ed. 
 - New York :  Oxford University Press,  1998. 
 - viii, 330 p. :  ill. ;  27 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9780198742845 (pbk. ) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.