Worrall, L. (1990). Geographic information systems: Developments and applications. Belhaven Press.
Chicago-čujuhus (17. p.)Worrall, Les. Geographic Information Systems: Developments and Applications. London ; New York: Belhaven Press, 1990.
MLA-čujuhus (9. p.)Worrall, Les. Geographic Information Systems: Developments and Applications. Belhaven Press, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
