Korte, G. (2001). The GIS book (5th ed., updated and expanded.). OnWord Press.
Lua i Stíl Chicago (17ú heag.)Korte, George. The GIS Book. 5th ed., updated and expanded. Australia: OnWord Press, 2001.
Lua MLA (9ú heag.)Korte, George. The GIS Book. 5th ed., updated and expanded. OnWord Press, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.