Dyfyniad APA

Bernhardsen, T. (2011). Geographic information systems: An introduction (3rd ed.). Wiley.

Dyfyniad Arddull Chicago

Bernhardsen, Tor. Geographic Information Systems: An Introduction. 3rd ed. New Delhi: Wiley, 2011.

Dyfyniad MLA

Bernhardsen, Tor. Geographic Information Systems: An Introduction. 3rd ed. Wiley, 2011.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.