Worboys, M. F. Gis: A computing perspective.
Lua i Stíl Chicago (17ú heag.)Worboys, Michael F. Gis: A Computing Perspective.
Lua MLA (8ú heag.)Worboys, Michael F. Gis: A Computing Perspective.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.