APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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