Longley, P. (2015). Geographic information science & systems (4th ed.). Wiley.
Chicago-čujuhus (17. p.)Longley, Paul. Geographic Information Science & Systems. 4th ed. Hoboken, NJ: Wiley, 2015.
MLA-čujuhus (9. p.)Longley, Paul. Geographic Information Science & Systems. 4th ed. Wiley, 2015.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.