References
- John Wiley Publishers Presenting a complete GIS solution 2002 http://www.wiley.co.uk/gis/ (last accessed 30 October 2002).
- Longley , Paul A. , Goodchild , Michael F. , Maguire , David. J. and Rhind , David W. 1999 . Geographical information systems: Principles, techniques, applications, and management , 2d ed. , 2 vols. , New York : John Wiley and Sons .