Cita APA (7th ed.)

Bernhardsen, T. (1999). Geographic information systems: An introduction (2nd ed.). Wiley.

Cita Chicago (17th ed.)

Bernhardsen, Tor. Geographic Information Systems: An Introduction. 2nd ed. New York: Wiley, 1999.

Cita MLA (9th ed.)

Bernhardsen, Tor. Geographic Information Systems: An Introduction. 2nd ed. Wiley, 1999.