Gorr, W. L. (2006). Learning and using geographic information systems: ArcExplorer edition. Boston, MA: Thomson Course Technology.
Chicago Style CitationGorr, Wilpen L. Learning and Using Geographic Information Systems: ArcExplorer Edition. Boston, MA: Thomson Course Technology, 2006.
Cita MLAGorr, Wilpen L. Learning and Using Geographic Information Systems: ArcExplorer Edition. Boston, MA: Thomson Course Technology, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.