एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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