Longley, P. A., & ...[et al.]. (2005). Geographical information systems: Principles, techniques, management and applications (2nd ed.). Johnwiley & Sons.
Dyfyniad Arddull ChicagoLongley, Paul A., and ...[et al.]. Geographical Information Systems: Principles, Techniques, Management and Applications. 2nd ed. New Jersey: Johnwiley & Sons, 2005.
Dyfyniad MLALongley, Paul A., and ...[et al.]. Geographical Information Systems: Principles, Techniques, Management and Applications. 2nd ed. Johnwiley & Sons, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.