Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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