Heywood, Ian. <br/><br/>
An introduction to Geographical Information systems./ 
Ian heywood. 
 - 4th. ed. 
 - Pearson/Prentice Hall:  Harlow, England,  2011. 
 - xxx, 446 p.: 
<br/><br/><label>ISBN: </label>9780273722595 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic Information Systems.
<br/><br/><label>LC Class. No.: </label>G70.2  / HEY 2011