Bernhardsen, T. (2002). Geographic information systems: An introduction (3rd ed.). John Wiley & Sons.
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Dyfyniad Arddull Chicago
Bernhardsen, Tor. Geographic Information Systems: An Introduction. 3rd ed. New Delhi: John Wiley & Sons, 2002.
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Dyfyniad MLA
Bernhardsen, Tor. Geographic Information Systems: An Introduction. 3rd ed. John Wiley & Sons, 2002.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.