Bernhardsen, T. (2014). Geographic Information Systems: An introduction. Wiley.
Chicago-čujuhus (17. p.)Bernhardsen, Tor. Geographic Information Systems: An Introduction. New Delhi: Wiley, 2014.
MLA-čujuhus (9. p.)Bernhardsen, Tor. Geographic Information Systems: An Introduction. Wiley, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.