Cita APA (7th ed.)
Bernhardsen, T. (2002). Geographic information systems: An introduction (3rd ed.). John Wiley & Sons.
Cita Chicago (17th ed.)
Bernhardsen, Tor. Geographic Information Systems: An Introduction. 3rd ed. New Delhi: John Wiley & Sons, 2002.
Cita MLA (9th ed.)
Bernhardsen, Tor. Geographic Information Systems: An Introduction. 3rd ed. John Wiley & Sons, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.