Cita APA (7a ed.)

Bernhardsen, T. (2002). Geographic information systems: An introduction (Third edition.). Wiley.

Cita Chicago Style (17a ed.)

Bernhardsen, Tor. Geographic Information Systems: An Introduction. Third edition. New York, NY: Wiley, 2002.

Cita MLA (8a ed.)

Bernhardsen, Tor. Geographic Information Systems: An Introduction. Third edition. Wiley, 2002.